The stretch it causes... I don't really care for it. BUT, as long as my girls benefit from it, I'm all for it! I currently have 2 month old plants, and a few week old plants growing under the GLR. I've seen some awesome grows (@Groff is the main reason I decided to try it), so I'm a believer, I just hope I'm able to dial my shit in so my plants properly benefit from it. It definitely takes some getting used to, tho, because I like feeding my plants frequently, but with the GLR, it seems they consume less food. Keep up the good work and research!
Interesting... What strains have you got under the GLR?
I wonder though if the plants actually comsume less or if there is less evaporation taking place? Having the lamp running for 20 hours staight is bound to dry out the medium much quicker than with the GLR...
Cheers,
Hardon