Used Punching Metal for sale (35,365)

Condition: as good as new (ex-display), Fronius TPS 4000 CMT ✅ Scope of delivery: ➤Fronius TPS 4000 CMT power source ➤Fronius FK 4000 ➤Fronius VR 7000 CMT wire feeder ➤Fronius Robacta CMT hose package or CMT hand hose package Kwsdpfx Adjwbixrowet ➤Fronius intermediate hose package ~1.5m ➤Fronius RCU 5000i ➤Fronius Interbus Rugged Line interface ➤Ground cable 3-4m ➤Pressure regulator from Messer (new) The prices listed start at ... euros. Prices/offers are customized based on the device configuration. CMT (Cold Metal Transfer) technology is particularly known for its high precision and flexibility when welding thin materials and delicate components. Unlike traditional MIG/MAG welding processes, CMT uses a controlled, pulsating wire feed, which transfers the welding wire very precisely into the weld pool. This minimizes spatter, enables excellent heat input control, and reduces distortion and discoloration of the material. We always have several machines in stock in different versions. Ask for a personalized configuration / additional options. ---- AVAILABLE FOR IMMEDIATE DELIVERY PROPER INVOICE A viewing is possible in Vienna, Austria! ✔ Insured shipping on a pallet is no problem! ✔ ✅Questions✅Questions✅ Questions: ✅Questions✅Questions✅ Questions✅ ►►►What is the condition of the machines? ►►► To explain, we buy like-new used devices, disassemble them, inspect everything, replace any worn parts if necessary, and only then, after successful test welding, is the device released for sale. "All" devices are clean and have neither burn holes in the displays nor countless burn holes or dents scattered throughout the device! You're buying an item from us that's ⭐worth seeing and doesn't look completely finished! ►►►Do we receive an invoice when you purchase from us? Yes, you receive a proper invoice from us. If you have a valid VAT ID, we can issue a net invoice if the requirements for intra-community delivery within the EU are met. ►►►What payment options are available? Prepayment or cash upon personal pickup ►►►Is insured shipping possible? Yes, we will be happy to send you the purchased set, well packaged and insured, on a Euro pallet. ►►► ►►►Is there a warranty? We sell the machines at one-third the original price and unfortunately don't have the flexibility to offer a warranty. You are welcome to test the devices on-site and pay in cash. ►►►Why buy from us? We are experts in this Fronius welding machine series and always have 60-80 devices in stock – exclusively Fronius, no other manufacturers! We are experts in these devices and don't sell anything we don't know about.

Condition: new, functionality: fully functional, Year of construction: 2025, laser power: 30,000 W, travel distance X-axis: 3,050 mm, travel distance Y-axis: 13,050 mm, travel distance Z-axis: 450 mm, positioning accuracy: 0.03 mm, repeat accuracy: 0.02 mm, workpiece weight (max.): 20,000 kg, input frequency: 50 Hz, total length: 16,800 mm, total width: 2,200 mm, total height: 5,120 mm, warranty duration: 24 months, working range: 13,000 mm, Equipment: CE marking, centralized greasing system, cooling unit, documentation/manual, dust extraction, emergency stop, fume extraction, safety light barrier, GS-CL Series, Glorystar Single Table Gantry Type Metal Laser Cutting Machine Laser Power: 12000-80000W Fits in a standard 40HQ container The GS-L Series is a high-power metal laser cutting machine with a gantry-type segmented bed design. It can be freely customized to meet processing format requirements according to customer needs. Key Features: ● Super Large Processing Format with a gantry-style segmented design. ● The GS-L Series has the largest Z-axis travel and height in its class in the industry. Supports extreme thickness cutting for plates over 20mm. Capable of cutting ultra-thick plates up to 70mm. ● High Negative Pressure Automatic Partition Dust Removal ● Equipped with a high-air-volume fan for effective dust removal. Technical parameters: Working area (mm): 13000mm*3000mm（bevel cut: 12500mm*2500mm） X axis travel distance (mm): 3050mm Y axis travel distance (mm): 13050mm Z axis travel distance (mm): 450mm X/Y axis positioning accuracy: ≤0.03mm/m Kjdpfx Adovmwn Hewowt X/Y axis repeat positioning accuracy: ≤±0.02mm Max. synthetic positioning speed: 110m/min Max. acceleration: 1.2G Min. setting unit: 0.001mm Floor size (mm): 18500mm*6500mm Main body dimension (mm): 16800mm*5120mm*2200mm Worktable max. weight capacity (T): 20 tons (even load bearing)

Condition: excellent (used), Machine: Used Lindemann Sobod 8 Metal Baler Bale size: 400mm x 400mm Specifications: see table Status: ready to use Kedpfx Adoxrz S Aowswt Condition: in very good maintenance condition Year of manufacture: unknown Power: electric Availability: March/April 2025

Condition: excellent (used), functionality: fully functional, Year of construction: 2022, For sale is a complete metal 3D printing system from Desktop Metal, suitable for additive manufacturing with metal powders using the binder jetting process. The system is ideal for prototyping, small-scale production, and research. Included in the purchase price: 1x Printer (Desktop Metal, 12-liter volume) 1x Sintering furnace 1x Gas valve for the sintering furnace Ksdpfxjwgky Ie Adwjwt 1x Drying furnace 2x Depowdering stations 1x Powder mixer 2x Industrial vacuum cleaners 6x Powder drums Not included in the purchase price (can be purchased optionally): 1x Additional drying furnace 1x Depowdering station (in-house development) 250 kg metal powder 17-4PH 100 kg metal powder 316L Additional powder drums Protective equipment for 2 people Other accessories

Condition: excellent (used), functionality: fully functional, Year of construction: 2021, operating hours: 250 h, Since 2021 for customer prints, product demonstrations and trade fair appearances in our possession. Completely ready for use and prepared by manufacturer-certified personnel from IGO3D, Desktop Metal Partner. Can be demonstrated in Hanover, Germany (also remotely via video call). Kjdpfx Aom Rgzaodwewt Easy-to-use Additive Manufacturing 2.0 solutions for industrial production — delivering transformative value. Office-friendly metal 3D printing with two steps (Print > Sinter) and eight materials. Key benefits: „ Easy, two-step processing „ User-friendly software-controlled workflow „ Patented smart Separable SupportsTM technology for quick post-processing „ Qualified for eight materials „ Designed for office-friendly printing „ A trusted system used worldwide with success The easy-to-use Studio System leverages proprietary Bound Metal Deposition™ (BMD), an extrusion-based metal additive manufacturing process where metal rods — metal powder held together by wax and polymer binder — are heated and extruded onto the build plate, shaping a part layer by layer. Once printed, the binder is removed via the debind process, and then sintered, causing the metal particles to densify. The Studio System 2 is even easier to use than ever before with new material formulations allowing printed parts to be placed directly into the furnace without the need for a solvent debind. The result is a streamlined two-step process with a nearly hands-free experience. Eight materials are available, including a range of steels, copper, and nickel and titanium alloys. Simplified metal part production using safe-to-handle bound metal rods The Desktop Metal Studio system creates metal parts for functional prototypes, tooling, jigs and fixtures, and low-volume production applications with expert metallurgy built-in. Easily produce difficult-to-machine parts featuring complex geometries like undercuts and internal channels to optimize metal components in an office setting.

Condition: excellent (used), Year of construction: 2022, TECHNICAL PARAMETERS: - cutting width 250 mm - cutting height 120 mm - Capacity up to 8,150 mb /8 h - sorting table with 4 punches - Electronics Controller with color touch screen "MITSHUBISHI" - Functions - full optimization of 30 dimensions in two quality classes, - creating cutting programs for different customers, - cutting at the place marked with a fluorescent pencil, - cutting the margin (beginning and end of the input material) - cutting in packages (several elements at once) - meter counters, total, shift, operator, monthly, - cutting accuracy ±0.2 mm - 5.5 KW motor (saw Ø500 – 140z) - Input material width 12 - 250 mm max. width/height (250 / 50 mm) Kedpfx Adowp Az Aowswt - Material height input 12 - 120 mm max. height/width (120 / 130 mm) - Input material length up to 4,200 mm - Lubrication Oil central lubrication system - Output automation Connection for inclined conveyor and sorting table

Condition: used, Ishida Checkweigher and Metal Detector Fully stainless steel Reject bin Weighing range - 0 to 1200 grams 240 volts Kodpfx Adsxtfymowswt

Condition: good (used), Fortress Phantom Metal Detector Fully stainless steel Aperture 500mm wide x 225mm high 1500mm long Belt Stop and alarm Kodpfxjxtfw Sj Adwowt Video available on request

Condition: used, Used 3D Printer EOSINT M 270 low operating hours (4910) Kwsdewd Ulvopfx Adwet

Condition: new, Year of construction: 2025, functionality: fully functional, coil outer diameter: 1,500 mm, coil inner diameter: 508 mm, product height (max.): 200 mm, feed length X-axis: 1,520 mm, feed length Y-axis: 3,020 mm, feed length Z-axis: 80 mm, warranty duration: 24 months, total height: 2,380 mm, total length: 8,900 mm, total width: 2,300 mm, load capacity: 1,300 kg, input frequency: 50 Hz, input voltage: 380 V, overall weight: 180 kg, repeat accuracy: 0.02 mm, workpiece weight (max.): 15,000 kg, Equipment: cooling unit, GS-J Series has various workbench sizes such as 3015, 4015, 4020, 6015 to meet different processing needs Suitable for batch processing of thin plates with high flatness requirements of 0.6-3.0mm Uncoiling machine parameters: Maximum weight of coil (kg): 15000 Coil width (mm): 200～1524 Coil outer diameter (mm): Φ800～Φ1500 Coil inner diameter (mm): Φ508mm~Φ610mm (cast iron pad) Coil thickness: (mm) 0.6-2.0mm (stainless steel) ≤1524mm 0.8-3.0mm (carbon steel) ≤1524mm Feeding length (mm): 0～ Maximum stroke of equipment Unwinding speed (m/min): 0～15 Moving speed (mm/s): 0-8 Lifting speed (mm/s): 3.0 Lifting stroke (mm) : 350 Leveling flatness (mm/㎡): ≤±3 Fixed feeding line height (mm) : 870 Sizing accuracy (mm/m) : Length direction ≤±0.2 Diagonal direction : ≤±0.8 Revolutionize Your Coil Processing with One Machine, Five Functions! Uncoiling, leveling, feeding, cutting, and blanking – all in one seamless automated system for maximum efficiency. Kwodpfx Ajv Awguedwjt Smart, Flexible & Versatile - Effortlessly cuts special-shaped workpieces, adapting to diverse production needs - Optional touchscreen control with top-tier international cutting systems - High-quality drag chain cables – durable, bend-resistant, and interference-free

Condition: new, functionality: fully functional, Year of construction: 2025, laser type: fiber laser, laser power: 40,000 W, Equipment: CE marking, centralized greasing system, cooling unit, documentation/manual, dust extraction, emergency stop, fume extraction, nozzle changer, safety light barrier, Type: exchange table, fully protected exchange table, ultra-high power, dual platform Kwedpfxowxam Is Adwst Laser power: 12KW15KW, 20KW, 30KW, 40KW, 3KW.6KW Standard hardware: scrap car, fire brick, fully automatic butter filling, dual-control workbench, adaptive multi-angle site placement, rear lift light-blocking door, rear camera, internal camera, monitoring display, radiation-proof glass, top cover beam light curtain, partition dust removal Optional hardware: light-blocking rubber strip, high-pressure proportional valve (standard above 6KW), safety door lock, independent laser cabinet, rear exchange table light curtain, top cover fan Optional functions: FDA configuration, CSA configuration, TUV configuration, conventional CE configuration

Condition: new, functionality: fully functional, Year of construction: 2025, laser type: fiber laser, Equipment: CE marking, centralized greasing system, cooling unit, documentation/manual, dust extraction, emergency stop, fume extraction, nozzle changer, safety light barrier, Laser power: 3KW, 6KW, 12KW Standard hardware: waste car, fully automatic butter injection, dual-control workbench, adaptive multi-angle site placement, beam light curtain Optional hardware: fire bricks, high-pressure proportional valve (standard for 6KW and above), safety door lock, Independent laser cabinet, rear exchange table light curtain, rear lifting light barrier, Kodpfowz Ukyjx Adwewt Rear camera, internal camera, monitoring display, radiation-proof glass, upper cover fan, upper cover, partition dust removal

Condition: new, functionality: fully functional, Year of construction: 2025, Equipment: CE marking, centralized greasing system, cooling unit, documentation/manual, dust extraction, emergency stop, fume extraction, nozzle changer, safety light barrier, High-strength welding bed Partitioned smoke extraction system Fully automatic butter injection system Fully automatic cutting, material saving, fast speed Kodpfxsw A Iilo Adwowt Cutting area 4000 × 2000 mm X‑axis travel 1520 mm Y‑axis travel 4020 mm Z‑axis travel 80 mm Max. combined positioning speed 170 m/min Acceleration 2.8 G Machine dimensions (L×W×H) 9500 × 2900 × 2380 mm Footprint 10500 × 3400 mm Net weight 8500 kg

Condition: new, functionality: fully functional, Year of construction: 2025, travel distance X-axis: 50,000 mm, travel distance Y-axis: 4,000 mm, input voltage: 380 V, input frequency: 50 Hz, warranty duration: 24 months, Equipment: cooling unit, GS-50040LB (Bevel Cutting) Ultra-Large Format Laser Cutting Machine 40kW Bevel Cutting + 60kW Straight Cutting Dual Beam, Dual Head, Dual Ultra Ultra-Large Cutting Area: 50m × 4m Dual High-Power Cutting Heads – 60kW Straight & 40kW Bevel Cutting Precision Cutting for Ultra-Thick Plates Bevel Cutting Performance: ✔ Y-Bevel: 40kW | 20mm Carbon Steel | 1.4m/min ✔ K-Bevel: 40kW | 30mm Carbon Steel | 0.35m/min ✔ V-Bevel: 40kW | 50mm Carbon Steel | 0.2m/min ✔ Straight Cutting: 60kW | 150mm Carbon Steel | 0.3m/min Kwedpfx Adsv Ng E Tewjt Applications: Aerospace | Shipbuilding | Bridges | Heavy Machinery

Condition: excellent (used), Year of construction: 2016, Loma Systems Metal Detector with Rejector Model: IQ³ Model conveyor: MD Conveyor, serial number: G7B3C2RS-35150D Year of construction: 2016 Kwedev T Ah Ejpfx Adwot 220-240 V, 1 Ph, 50/60 Hz, 3 A Belt width: 300 mm, clearance: 350 mm x 150 mm Total dimensions: 2020 mm x 1080 mm x 1120 mm

Condition: excellent (used), Year of construction: 2012, Lock met 30+ Throat / Vertical Fall Metal Detector The MET 30+ UNIVERSAL compact vertical fall system can be installed at the beginning of the production line to inspect materials in bulk powder or granule form or anywhere for free falling products. • Detects real-life contaminants • ATEX zone 21 approved • Throughput up to 50 tonnes per hour • Quick release sealed valve or cowbell reject mechanisms available • Sealed to IP 66 for washdown applications Kwsdsu Dntljpfx Adwot

Condition: excellent (used), Year of construction: 2020, Elektron Metal Detector Aperture 180mm Wide x 405mm High Belt length 1500mm Long Stainless Steel Two run features options - alarm and stop or air reject blast Kwjdpevw D Iusfx Adwot Reject bin In excellent condition

Condition: used, Year of construction: 2006, Brake force 300 tons Working length 6100 mm Distance between uprights 4550 mm Throat depth 400 mm Punch stroke 320 mm Table width 220 mm Fast speed (0 – 100) mm/sec Woriking speed (0 - 7) mm/sec Upstroke speed (0 – 90) mm/sec Hydraulic pressure (max) 255 bar Main electric motor 18,5 KW Kwodpfewhcycex Adwet Length 7500 mm Width 2900 mm Height 3700 mm Weight (aproxim.) 32000 Κgr

Condition: new, Year of construction: 2025, -TFON Lite SURFACER® Series Kodeqzxhyspfx Adwjwt The TFON Lite SURFACER® Series enables simultaneous processing of multiple parts, offering unmatched versatility through a range of consumable options and an efficient vacuum table system. Designed for ease of use, it features quick brush changes and the capability to mount two different brushes tailored to your specific applications -With brushes mounted parallel to the table, the system guarantees flawless grinding performance with every use. Ergonomically engineered, the motor weight is supported by the machine frame itself, significantly reducing operator fatigue and improving workplace safety -Backed by TFON’s trusted guarantee, the SURFACER® Series strikes the perfect balance between minimizing operational costs and maximizing finish quality Key Specifications: -Minimum Material Size: 80 × 80 mm. Material Thickness: 3 – 200 mm. Maximum Material Width: 800 mm. Maximum Material Length: 500 mm.

Condition: new, Year of construction: 2025, -TFON Leveltech® Leveling Machine -The TFON Leveltech® is a robust and precise leveling machine designed to handle a wide range of material thicknesses with efficiency and ease. Engineered for reliability and performance, it ensures flat, smooth surfaces on metal sheets and strips to meet stringent quality standards Kodpfx Aokyrphodwjwt Key Specifications: -Material Thickness: 1 mm – 30 mm -Maximum Material Width: 1,600 mm -Minimum Material Length: 145 mm -Quick Change System for Straightening Rollers: Standard -Flattening Gap Adjustment: Servo Hydraulic with PLC Control. -Machine Dimensions (L × W × H): 5,465 × 6,735 × 2,300 mm. -Total Weight: 40.000 kg

Condition: new, Year of construction: 2025, -TFON Leveltech® Leveling Machine Series -Model: L-9060. -Material Thickness: 1.0 mm – 30.0 mm. -Maximum Material Width: 600 mm -Minimum Material Length: 145 mm. -Flattening Gap Adjustment: Servo Hydraulic / PLC Controlled Overload Protection: Standard Machine Weight: 26.000 kg. Machine Dimensions (L × W × H): 4,400 × 7,185 × 2,260 mm Model: L-9011 Material Thickness: 1.0 mm – 30.0 mm. Maximum Material Width: 1,100 mm. Minimum Material Length: 145 mm Flattening Gap Adjustment: Servo Hydraulic / PLC Controlled Overload Protection: Standard Machine Weight: 31.000 kg Machine Dimensions (L × W × H): 4,600 × 7,185 × 2,260 mm Model: L-9013 Material Thickness: 1.0 mm –30.0 mm Maximum Material Width: 1,300 mm Minimum Material Length: 145 mm Flattening Gap Adjustment: Servo Hydraulic / PLC Controlled Overload Protection: Standard Machine Weight: 35,000 kg Machine Dimensions (L × W × H): 5,000 × 7,185 × 2,260 mm Model: L-9016 Material Thickness: 1.0 mm –30.0 mm Maximum Material Width: 1,500 mm Minimum Material Length: 145 mm Flattening Gap Adjustment: Servo Hydraulic / PLC Controlled. Overload Protection: Standard Machine Weight: 40.000 kg Machine Dimensions (L × W × H): 5,200 × 7,185 × 2,260 mm Model: L-9020 Material Thickness: 1.0 mm –30.0 mm Maximum Material Width: 2,000 mm Kwjdpfx Ajhwb U Tjdwst Minimum Material Length: 145 mm Flattening Gap Adjustment: Servo Hydraulic / PLC Controlled. Overload Protection: Standard Machine Dimensions (L × W × H): 5,700 × 7,185 × 2,260 mm.

Condition: new, Year of construction: 2025, *TFON Leveltech® Leveling Machine Series -Models: M-5560, M-5511, M-5513, M-5516. -Engineered for precise leveling of materials with a thickness range from 1.0 mm to 15.0 mm, these models offer flexibility in material width and advanced control features for optimal performance. -Material Thickness: 1.0 mm – 15.0 mm -Maximum Material Width: M-5560: 600 mm. Kjdpfxjhwb Uwj Adwswt M-5511: 1.100 mm. M-5513: 1,300 mm. M-5516: 1,500 mm. Minimum Material Length: 110 mm Flattening Gap Adjustment: Servo Hydraulic / PLC Controlled Machine Weight: M-5560: 12.000 kg M-5511: 15.000 kg M-5513: 18,000 kg M-5516: 19.000 kg Machine Dimensions (L × W × H): M-5560: 2,800 × 2,905 × 1,950 mm M-5511: 3,300 × 2,905 × 1,950 mm M-5513: 3,500 × 2,905 × 1,950 mm M-5516: 3,700 × 2,905 × 1,950 mm

Condition: like new (used), Year of construction: 2026, operating hours: 8 h, functionality: fully functional, machine/vehicle number: SG202640, total length: 1,500 mm, power: 4 kW (5.44 HP), overall weight: 650 kg, total width: 800 mm, total height: 1,150 mm, input voltage: 380 V, warranty duration: 12 months, Pipe Shrinking, Profile Forming Machine SG40NC Machine Model: SG40NC Product Description: Microcomputer-controlled and hydraulically driven. Kwedpfjyak Ikex Adwjt Equipped with a mobile foot switch featuring three functions: automatic operation, emergency stop, and continuous emergency stop, ensuring high safety. Capable of multiple processing methods including tube Forming, tube expanding, tube end blunting, and bulging. Processed shapes include concave-convex joints, elongated, flat, square, flared, angled, V-shaped, open elbow, etc. Molds can be changed according to the user’s processed products. Mold replacement is simple and convenient, facilitating flexible production. The machine has a compact and sturdy structure, uses hydraulic power, operates stably with a high yield rate, minimal vibration, and low noise. It can perform tube end reduction, expansion, bulging, upsetting rib forming, and other shape forming processes. Suitable for processing various shapes at the connecting parts of pipe fittings (for insertion), automotive oil pipes, air ducts, water pipes, and air conditioning pipes. Maximum Tube Forming Capacity mm Ø40×2mm Maximum Tube Forming Length mm 100mm Motor Power kW 4 Weight kg 600

Condition: new, Year of construction: 2025, total width: 1,200 mm, total length: 2,500 mm, total height: 2,080 mm, overall weight: 3,700 kg, The Multi Destroyer is a machine specially designed for crushing PCB (Printed Circuit Board). The double-shaft shredder located at the top effectively breaks down PCB and feeds them into the granulator below. The granulator converts the shredded material into fine granules, making it easier to recycle and reuse. Ksdefm E E Aopfx Adwjwt The double-shaft shredder uses special blades made of wear-resistant steel, offering maximum durability and performance. The feed rate of the material can be easily adjusted via a user-friendly control panel. The granulator is optimized for high efficiency, ensuring the final product is of the desired size. The Multi Destroyer uses a jet filter to minimize dust formation, ensuring a cleaner and safer working environment. This feature is especially important in sensitive recycling processes. The Multi Destroyer is an ideal solution for PCB recycling, meeting industry demands with its high performance. Its superior engineering design ensures the machine is long-lasting and durable.

Condition: excellent (used), Year of construction: 2014, functionality: fully functional, CNC punching machine with only approx. 11,600 operating hours, immediately available Manufacturer: TRUMPF Model: TruPunch 3000 - 1600(S11) Year of manufacture: 11/2013 Operating hours, approx.: only 11,600 h Sheet format: Large format TECHNICAL DATA: Working area: 3,000 x 1,500 mm, with repositioning Max. workpiece weight: 160 kg Punching and hold-down force: 180 kN and 20 kN Max. stroke rate: Punching: 800 1/min, Marking: 2,500 1/min Dimensions (L x W x H): 6,500 x 6,203 x 2,252 mm SPECIAL EQUIPMENT: - MultiTool function - MultiShear function - Marking / Fast embossing function - Deburring and roller technology - Adaptive stroke calibration - Punch slug breakage monitoring - Lowerable die Kwjdpfsxn Tywjx Adwjt - Spray degreasing for dies with fill level monitoring - Additional clamp - Sheet collision detection - Stop pin, outer side, left position outside STANDARD EQUIPMENT: Machine: - Working area 3,000 x 1,500 mm (with repositioning) - Rigid C-frame for easy access - Coordinate guidance for high-precision machining - Linear magazine with 17 tool stations and 3 clamps - Drives with maintenance-free 3-phase servo motors - Repositioning device with programmable hold-down - Ball tables - Parts chute - Programmable support table - Good parts container - Scrap container - Automatic shut-off mechanism - Transport and installation device - Stop pin (right side, inside) - Foot switch for closing the clamps Punching head: - Servo-electric punching head - Rotatable single-tool adapter - Programmable hold-down - Tool length compensation - Spray degreasing for punch - Punch slug extraction - Forming - Manually adjustable pressing force - Stroke counter for punch - Monitoring of fill level for thread-cutting and tool lubrication Control: - Control system based on Bosch MTX CMP 70 - Operating panel with 17" touchscreen - NC program management - Integrated technology data - Teleservice via Internet - Integrated e-shop - Production planning - Programming - Advanced workshop programming - Data transmission - USB interface Safety: CE marking (ex works) Dual-beam light barriers