Yeah, the numbers are funny. They claim they will pay for themselves in energy savings in a year, but that seems to be against some unnamed alternative in their "up to 70% more efficient" claim.
High pressure sodium lamps (apparently the norm for indoor commercial food growing) look to be about 1.8µmoles/watt, compared against the ">2 µmoles/watt" of these lights, well, its going to take a long time to save $1000 in energy on a 250 watt lamp.
Lamp lifetime may tip the scales in favor of these LED lamps. Lamp size may also help, I used a 600 watt high pressure sodium lamp in my calculation against the 250 watt LED.
(µmoles are new units to me. I think I got through the lumens-lux-µmoles calculation correctly, but maybe not.)
High pressure sodium lamps (apparently the norm for indoor commercial food growing) look to be about 1.8µmoles/watt, compared against the ">2 µmoles/watt" of these lights, well, its going to take a long time to save $1000 in energy on a 250 watt lamp.
Lamp lifetime may tip the scales in favor of these LED lamps. Lamp size may also help, I used a 600 watt high pressure sodium lamp in my calculation against the 250 watt LED.
(µmoles are new units to me. I think I got through the lumens-lux-µmoles calculation correctly, but maybe not.)