Our original style fixture, but with upgraded diodes and driver - white LEDs with approximately 58% electrical efficiency - currently the highest efficiency full spectrum LED, in early 2019.
The 6 panel QB-320 is offered in 3000K, 3500K, and 4000K.
QBv2 (Samsung LM301B) panels, fan-cooled by a 92mm SUNON fan, powered by the Meanwell HLG-320H-2100C at up to 320W.
Providing >183.7lm/W, with an 94% efficient driver, this light outputs a total system efficacy of about 172lm/W, equivalent to 2.5-2.6uMol/J PAR efficiency.
Note: Dimming the light will increase efficiency to 2.7uMol/J and higher.
LED Gardener has an outstanding review of quantum boards here: http://ledgardener.com/quantum-boards-new-alternative-cobs/
Calculations done using Samsung LED Calculator