Horticulture Lighting Group 260 Watt XL V2 RSpec Quantum Board DIY Kit (Full-Cycle / Flower)


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260 Watt XL DIY LED Grow Light Kit with Two High-Efficiency QB288 R-Spec LM301H + 660nm Quantum Boards

Top Features

  • Dimmable down to 20% from 285 Watts
  • 3ft (90cm) long heatsink for a wider spread
  • 500 watt HID replacement (use 2 kits to flower a 4′ x 4′ space)
  • Veg Footprint 4′ x 4′ (16 sq ft)
  • Recommended Flower Footprint 3′ x 3′ (9 sq ft) or 2′ x 4′ (8 sq ft)
  • 3500K + 660nm white light full spectrum for better results
  • Reliable passively-cooled design
  • Better canopy light penetration with diffused light
  • Ideal for full cycle grows or flowering
  • 1-year manufacturer’s warranty


Kit Includes

  • 2 x QB288 V2 R-Spec USA-made Quantum Boards with Samsung LM301H + 660nm Top-Bin Diodes
  • 1x Slate 2 Triple Predrilled 891mm Heatsink
  • Inventronics LED Driver. Boards should be wired in series with the driver for maximum output.
  • Full-range potentiometer (Video: how to hook up dimmer)
  • 6ft Nema 5-15P 16/3 SJTW NA Power Cord or equivalent for standard 120VAC with cable connector
  • 2ft solid core Wire, 2x Wago Connectors for DC wiring
  • Hanger Clips

Assembly instructions


  • Dimensions: 89.1cm x 20.5cm
  • Lamp Efficacy with QB288 V2 Rspec 2.6 µmol/J
  • Board Level Efficacy with QB288 V2 Rspec 2.73 µmol/J
  • No Thermal Interface Material is required between the LED board and the heatsink
  • Remove black plug on driver and use Philips head screwdriver for dimming
  • Kit is shipped disassembled and requires assembly before use
  • Tools required: screwdriver and wire strippers (or scissors). No soldering required.



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