there's a very specific frequency, which deletes their 2hr transition to sleep, so if u interrupt em to stroke some plant in the ambiance of darkness, without ur green, headlamp... u knock em right back out. if a $5led flashlight existed, i wouldn't feel the need to envy $3,000 light setups. the light mfr's, prolly view this, as a negative... but 600 $5 lights to foodstamp growers... there r alot more of those, than $1200-$3k light budget teepees. want i should try to locate it? his messenger- his lacky says, they HAVE to at least, respond to u... aha... this should do ya. perhaps, he'll straight up tell ya. i lost, or gave my copy, unfortunately, but the rest would b dogma, or... obsolete so it's the only nugget in his book, I'd b buyin for. yrs, ahead of his time, though. they didn't have programmable lights, at the time, that I'm aware of and full spectrum... wasn't actually, full spectrum. don't even remember if led's were available, in 03ish.