QB288 V2 & V2 Rspec Board Guide


QB 288 V2 and QB 288 V2 R spec have 50V-54V DC forward voltage and same driver options will work for all.

DO NOT wire different version boards in parallel. For parallel wiring it has to be all QB 288 V2 R spec or all QB 288 V2 or all QB 288 V1 boards on a driver.

High efficiency boards designed for Horticulture Lighting projects. No Thermal Interface Material is required between the QB board and flat metal heatsink.


  • 288pcs Samsung 301H
  • Connectors rated 300V 9A
  • Estimated LER 321.60 lm/W
  • Estimated QER 4.86 µmol/J
  • Dimensions 6.833" x 11.25
  • Max current per board 3000mA


Flux Characteristics with QB 288 V2 3000K at 55C

 VDC Current (mA) Watts at Board  Lm/W at Board (55C) μmoles/joule at Board (55C)
45.72 500 22.86 206 3.00
46.98 1050 49.33 196.10 2.85
47.70 1400 66.78 190.50 2.77
48.96 2100 102.82 180.77 2.63
49.50 2400 118.80 177.50 2.58
49.86 2800 139.60 173.80 2.53
  • Allow tolerance of an additional 1V while matching drivers.
  • Please use this as a reference only.

May require an Aluminum plate or heatsink if running 50+ watts. Heatsink requirements depends on application and power.

While using multiple boards, series wiring is preferable to avoid thermal runaway if a board gets disconnected.


Popular Driver


Driver Notes (Single and Multiple Parallel Boards)

Non Dimmable

Dimmable (Plastic Case)

Dimmable (MetalCase)

Parallel Wiring

Multiple Boards can be wired in parallel. Different batches of boards may have slightly different voltages. Use only boards from same batch for parallel connection. Do not use different spectrum boards in parallel as they may have slightly different voltages

Tip: Avoid daisy chaining multiple boards as shown in the 2nd image below. This causes first board to handle a large current and can reduce life of board's electrical trace. Wiring as shown in 1st image is preferable.

Parallel wire QB

Series Driver Notes

Non Dimmable


Series Wiring

Maximum 5 Boards can be wired in series. More than 5 boards in series will exceed the recommended maximum voltage of the board connectors and is not recommended.

 Series Boards

NOTE: Boards purchased in multiple orders may be from different batches may have different voltages and may not work share equal current if connected in parallel. Use them in series to avoid some boards pulling more current than others.

Parallel-Series Wiring (Advanced)

It is possible to have partial benefits of parallel and series together using some driver configurations. For example  HLG-320H-C2800 with 2 parallel string of 2 boards in series.

 Series Parallel