I have one on my nano only cause it fits into the old lid. Colors look muted/boring because it only has blue, royal, and cool white LEDs on the grow. Very little in the 390-420nm range. No warm white, amber, or lime either. PAR isn't bad, I measured like 250-300 at the top of the rocks and 100 on the sand of a 12" tank. This is just 1 grow 12". First gen of these had the bad LED placement that cause
weird shading that was fixed in recent production. but again the light is in an old plastic enclosure mounted maybe 1" above the surface. If it wasn't for the form factor I wouldn't use it for the $ needed.
A 12" glow and grow together are $341 plus tax which is insane for 40w of lighting. Luckily I got this one on sale for like $115 otherwise I wouldn't have gotten it.