imo unless you have unreasonably cold temps, i feel as though MH are obsolete. if grown properly you should NEVER see any stretch from cfl & ho t5's in veg. t5's being more popular b/c they cover a wider area and are more efficient.
after following this thread from start to finish, this is my personal take on the subject:
led's have come a long way, and are now a viable option for flowering. are they the best option? it depends if your growing for quality or quantity. its about what is more important to you and your grow personally. i think that since LED's have more usable light that they will produce a SLIGHTLY overall better quality product. this is just an assumption of mine, b/c i have never grown with LEd's or even smoked mj from an LED' grow(that i know of). BUT led's lack in the quantity department, UNLESS running SOG. hps seems to produce larger bud sites then LED. due to more penetration power.
what i'd really like to see is a hps w/CO2 vs led grow w/CO2... i wanna see how they match up under 100% optimal conditions
for me its as simple as this...if i'm a new grower i should look into LED's as a possible pathway. BUT there is no reason in their current state to replace hps with LED
i have yet to puchase my 600w hps light. after going through this thread, a lot of google searches, and getting a few questions answered. i've decided that hps is right for me.
EDIT: a question i cant find the answer for. maybe u can help pjammers.
i've heard from a fellow local grower who has a very strong opinion that LED's are now the BEST...and theirs no debating him b/c he's never wrong(u know the type)
i heard from him that they are now making 5watt diodes. from every post i've seen, all of your lights are running 3watt diodes. is there any truth to this? are they still beta testing the higher wattage, and have yet to put into production?