A new space-efficient style, with upgraded diodes and driver - white LEDs with approximately 58% electrical efficiency - currently the highest efficiency full spectrum LED, in late 2018.
The double panel QB-130 is offered in 4000K only, and pulls up to 130W.
QBv2 (Samsung LM301B) panels, fan-cooled by a 92mm SUNON fan, powered by the dimmable Meanwell ELG-150-24, using an attached potentiometer.
Providing 183.7lm/W at the driven current, with an 91% efficient driver, this light outputs a total system efficacy of about 167lm/W, equivalent to 2.5uMol/J PAR efficiency.
Note: We offer 5- and 6- panel lights that use more efficient drivers with dimmers, allowing 2.7uMol/J PAR efficiency.
LED Gardener has an outstanding review of quantum boards here: http://ledgardener.com/quantum-boards-new-alternative-cobs/
Calculations done using Samsung LED Calculator