QB120 Board Guide

Designed by Horticulture Lighting Group

Amzon Prime Qb288 Link

High efficiency boards designed for Horticulture Lighting projects. QB 120 Boards can be powered upto 70 watts. Ideal for use in grow tents or grow area with reflective walls and grow spaces with limited height. No metal heatsink or thermal paste is required .


  • 120pcs Samsung 561C top bin Diodes
  • Molex Connectors rated 300V 9A
  • Estimated LER 321.60 lm/W
  • Estimated QER 4.86 µmol/J
  • Dimensions 280mm x 240mm
  • Max current per board 2800mA

Flux Characteristics with S6 Bin

Voltage (Min Vf dc) Voltage (Max Vf dc) Current (mA) Watts at Board (Min Watts) Watts at Board (Max Watts) Max Lm/W at Board (40C) Min Lm/W at Board (40C) Min μmoles/joule at Board(40C)
21.92 22.72 1050 23 23.9 193.3 186.5 2.82
22.32 23.12 1400 31.1 32.2 186.8 180.2 2.72
22.96 23.76 2100 48.2 49.9 175.5 169.3 2.56
23.28 24.16 2500 58.3 60.04 169.9 163.8 2.48
23.52 24.4 2800 66 68.4 166 160.1 2.42


* Min values calculated using AZ Voltage Bin, Max values calculated using A1 Voltage Bin

** For more details refer to Calculator here. Use values LM561C, 3000K, 80 CRI, AZ or A1 Voltage Bin, S6 Flux bin. # of LED as 132x (number of boards). Change IF_Drive mA to see lm/W and flux for different power.

Board does not require heatsink for operation. However derating power may be required is backside is blocked and unable to help board with cooling

The notes below are provided as a designs ideas and are not instructions to assemble a lamp. Do not touch live boards as they run on high voltage and may have exposed solder contacts that can cause serious shock. Driver DC side may hold charge for few seconds even after disconnecting AC mains and could cause shock. This is not a safety guide.

While using multiple boards, series wiring is preferable to avoid thermal runaway if a board gets disconnected. MW HLG series CV drivers allow Voltage adjustment and can be used to limit board wattage by limiting the voltage.


QB 120 with DC barrel connector is recommended for 1 or more boards in parallel with max 3A . Additional boards connected in parallel share the power of driver. best suited for lower power application (max 70 watts). Recommended drivers

  • OWA-60U-24
  • GSC-40B-1400
  • GSC25B-1050
  • GSC18B-700


QB 120 with Molex connector is recommended for 1 or more boards in parallel or in series. 300V rated Molex connector allows upto 10 Boards in series. Boards feature connectors on each side for daisy chaining power to next board. for higher power parallel application, wire each board separately without daisy chaining to avoid voltage drop after first board. Recommended drivers


Popular Driver



Non Dimmable


* HLG series drivers are CV+CC . Driver with 54V can be used instead of 48V. However power will reduce by 10%-15% . example: HLG-120H-54 can be used instead of HLG-120H-48


Single or Multiple in Parallel

Non Dimmable


Series Wiring Options

4x QB120 in Series with HLG-240H-C2100

QB 120 in series

4x QB120 in Series with HLG-240H-C2100

4 Boards in series


Series & Parallel Wiring Options

2x QB 120 can be wired in series to power with HLG-100H-48

2x QB 120 can be added in parallel to each board to power with HLG-240H-48

QB Series Parallel


Parallel Wiring Options

2x QB 120 can be used in parallel with a HLG-100H-24

QB Parallel Wiring


4x QB 120 can be used in parallel with a HLG-240H-24

Qb Parallel