I got one similar, and appears to work ok. Grow oat/cat grass
Light distance should be about 12" ??
Also have another one that is white color, ful spectrum-screw in bulbs with heat sinks- it gets really hot.Similar to the piccy below.
Distance should be @ 8-12" ?? This mfr said don't use colored( red/ blue) leds' as they are detrimental to eating the plants?? What is that about?