LED production line design is a three-module decision: lamp-shell extrusion (T5/T8 PVC or silicone), LED-strip SMD assembly with surface-mount placement, and robotic adhesive dispensing for potting and lens bonding. Each module is sold separately by Chinese OEMs, with combined lines quoted from roughly USD 95,000 per set on Alibaba sourcing listings [S1].
Buyers building new capacity in 2026 most often mix one extrusion line, one SMD line, and one dispensing cell rather than buy a single turnkey system. That split lets the factory swap chemistry (PVC to silicone) or connector (copper-wire to copper-free FPC) without scrapping the whole line.
Three Line Architectures, Compared on Decision Criteria
Lamp-shell extrusion lines, LED-strip SMD assembly lines, and robotic dispensing cells solve different problems and rarely substitute for each other [S1][S2][S3]. Lamp-shell extrusion covers T5/T8 PC housings, LED rope light jackets, and silicone neon-flex sleeving, with screw diameter and L/D ratio as the dominant spec gates; Zhongshan Longshine Zhenglong lists single-colour, two-colour, and tricolour variants with and without copper wire on one platform [S2].
LED-strip SMD assembly covers reflow soldering of 2835, 5050, or 2835+IC addressable packages onto copper or FPC substrate; throughput is rated in metres per minute of strip fed, and the reflow oven zone count (typically 6-8 zones) sets the thermal budget for lead-free SAC305 paste. Robotic dispensing cells handle dam-and-fill, underfill, and lens potting, with 3-axis or 4-axis travel and shot-volume resolution (often 0.01 ml) as the spec gates [S3].
Extrusion Line Specs: Screw, Material, Output
Extrusion lines for T5/T8 lamp shells and LED strip sleeving run on single-screw extruders in the 45-65 mm diameter range, with L/D ratios commonly between 25:1 and 30:1 for PVC and 28:1 to 32:1 for silicone. Zhongshan Longshine Zhenglong markets one-colour, two-colour, and tricolour co-extrusion configurations with and without copper wire feed, and pairs them with a separate FPC-LED PCB separation and packing device [S2].
Material choice sets the line, not the other way around. PVC extrudes at roughly 160-180 deg C die temperature, silicone needs 140-180 deg C with post-cure, and TPU falls between. Buyers running both PVC rope-light jackets and silicone neon-flex sleeving usually buy a 45 mm line for PVC and a 50-65 mm line for silicone, since purging silicone through a PVC-conditioned screw wastes half a shift. The downstream haul-off, cutter, and stacker must match the line speed, typically 5-25 m/min for strip sleeving, so spec the cutter for the upper end of that range, not the average.
SMD Assembly and Pick-and-Place Spec Gates
SMD placement capacity is the single number that drives SMD line price. Entry lines run 30,000-50,000 CPH (components per hour), mid-range lines 80,000-120,000 CPH, and high-end lines above 150,000 CPH. For LED strips using 2835, 5050, or 5630 packages, a 40,000-60,000 CPH machine is usually enough, since the strip pitch is large and feeders stay under 30 slots. [S2]
Reflow oven zone count matters more than total length for LED strip work. Six-zone ovens handle lead-free SAC305 at peak 245-255 deg C; eight-zone ovens add a soak zone that cuts voiding on thermal-pad LEDs (used in high-bay fixtures) and on chip-on-board COB modules. Nitrogen atmosphere is optional but common above 245 deg C peak to reduce oxidation of copper pads on FPC. AOI after reflow is now standard, not optional, because FPC warpage above 0.3% across a 5 m strip will lift components out of the solder meniscus.
Dispensing and Potting: Robot, Valve, Shot Volume
Dispensing robots on LED lines do three jobs: dam-and-fill of silicone lenses, underfill of flip-chip LEDs, and potting of driver compartments. Three-axis Cartesian gantries cover most strip work, while four-axis SCARA or six-axis arms serve lamp-bulb potting where the part rotates [S3]. The valve type sets the spec: time-pressure valves handle 0.05-5 ml shots, auger valves cover 0.5-50 ml with better volumetric accuracy, and jetting valves reach 50-500 Hz for high-speed micro-dots.
Mix ratio is the second hard gate. Two-part silicone for lens potting is almost always 10:1 by weight; the meter-mix unit must hold ratio to plus or minus 2% or the cured Shore A will drift out of spec. Cixi-based suppliers on Made-in-China list anaerobic glue dispensers, two-component mixing meter dispensers, and benchtop robots as separate line items, confirming that buyers assemble rather than buy the cell as a single SKU [S3]. Buyers running UV-cure acrylates should add a 365 nm LED flood array above the dispense point, since pot life after mix can drop below 30 s.
Line Integration: Throughput Balancing and UPH
Units per hour (UPH) is set by the slowest station, not the fastest. A typical 2026 LED strip line runs extrusion at 15-20 m/min, SMD placement at 50,000 CPH equivalent on a 5 m strip, and dispensing at 200-400 dots/min; the bottleneck is almost always reflow cool-down, which adds 2-4 minutes of travel through the oven tail. Spec the conveyor width to the widest FPC (usually 120 mm for RGBW strips, 250 mm for COB strips) and the conveyor speed to the reflow profile, not the placement head. [S1]
For a 500,000 m/month LED strip line, three extrusion lines, two SMD lines, and two dispensing cells is a common ratio, because extrusion is the most reliable station and SMD is the most variable. Lamp-shell T5/T8 lines run at lower UPH (roughly 2,000-4,000 pieces per 8 h shift per extruder) because the part is a 3D formed shell, not a flat strip. Buyers underestimating this often stack two SMD lines on one extrusion line and starve the SMT.
Standards, Audits, and Sourcing Risk in 2026
LED production equipment itself is not ATEX- or IECEx-rated as a rule; the hazardous-area classification applies to the end-product luminaire in its installed environment, not the assembly machine. Buyers should still confirm CE marking on the extrusion and dispensing machines for EU shipment, and confirm UL 508A panel certification for any control cabinet exported to North America. For LED quality downstream, the 2026 supply signal is that more European retailers now require IEC 62717 (LED module performance) and IEC 62471 (photobiological safety) reports per SKU, not per factory. [S3]
For buyers sourcing from Guangdong and Zhejiang, three supplier checks matter: an on-site audit of the assembly floor, a sample run on the actual production line (not a demo unit in the showroom), and a trial of the FPC-PCB separation and packing device, which is the single most failure-prone station on a strip line. Zhongshan Longshine Zhenglong and the Cixi-based dispensing supplier both list sample availability and OEM/ODM service, which is a baseline, not a guarantee; request a 2-week trial run before issuing the PO [S2][S3].
For a deeper look at the SMT-side spec gates, the LED manufacturing equipment selection guide maps pick-and-place and reflow choices against strip types, while the 2026 LED quality standards brief covers the IEC 62717 and IEC 62471 audit pattern that now drives European retailer acceptance. For a related but distinct line type, the molding line reference covers the resin-sand and V-process cells used for lamp housings when the buyer routes T5/T8 shells through casting rather than extrusion.
Detailed specification references: automatic molding line, and conveyor sorting line.