HPS or MH throughout entire grow?
- Thread starter stephen94
- Start date
doobiee
Well-Known Member
thats not true baseline, if you use HPS for veg your nodes will be long.. if you use MH you will have tight short nodes(i prefer)
MH is used for veg because of the blue light it gives off, it represents the summer and the HPS gives a red/orange light which indicates the short autumn days, if i had to choose I would pick MH.
MH is used for veg because of the blue light it gives off, it represents the summer and the HPS gives a red/orange light which indicates the short autumn days, if i had to choose I would pick MH.
stephen94
Well-Known Member
wow completely 50/50 response. ive seen a stadium grow with just MH and dude got like 2 lbs of of each 1000 W MH light, then again the most common is hps all the way through....i think ill go with hps. has anyone actually noticed a big difference in the likes of each? i mean is the internode spacing THAT much different. or are the buds that much thicker?
stephen94
Well-Known Member
i know that both works out great, i just have room and money for one. i soon want to get a clonebox that has high wattage cfl's (like a 200W or 2x125W CFL's - act. wattage) in a seperate room. I just didnt know if anyone has done just a mh grow or just a hps grow from Experience...and had anything to let me know, any problems they had, etc.
kaptainchron420
Member
do you have money for a dual ballast? then you can have the best of both worlds in one bulb..
I use HPS for the entire grow cycle, have been for years with no probs.
kaptainchron420
Member
how many 600w bulbs would you use for a 56 sq/ft space?
, i think ill get a mheasygrinder
New Member
A plant doesn't use lumens though, a hps may have far more "lumens" than a mh but a mh bulb's cri is much higher.
cri means color rendering index which is directly related to plants and the amount of useable light,
hps bulbs sit around 20-25% and mh bulbs around 80%
the mh has more useable light for the plant
http://htgsupply.com/viewproduct.asp?productID=49762
what about ^^^^ an hps bulb with more blue spectrum light. it has a great combination of both spectrums if you can only afford one light right now. on my first grow i had an hps light and was using that for veg. i ended up ordering a 1000W mh light almost halfway through. when i got it i put it up immediately. the difference that i noticed was that it had tighter node spacing like has been said and it seemed to be growing at a slightly faster pace. not sure if that last part was placebo effect or real but it def started to get a llot denser vegetative growth than with just the hps. i never tried the mh for flowering as i had an hps but froom what most people recommend the hps light will give denser nugs than mh.
what about ^^^^ an hps bulb with more blue spectrum light. it has a great combination of both spectrums if you can only afford one light right now. on my first grow i had an hps light and was using that for veg. i ended up ordering a 1000W mh light almost halfway through. when i got it i put it up immediately. the difference that i noticed was that it had tighter node spacing like has been said and it seemed to be growing at a slightly faster pace. not sure if that last part was placebo effect or real but it def started to get a llot denser vegetative growth than with just the hps. i never tried the mh for flowering as i had an hps but froom what most people recommend the hps light will give denser nugs than mh.
Iron Lungz23
Well-Known Member
Mate, most HPS systems have MH conversion bulbs to match so all u need is the one ballast! Have the best of both worlds!
i started growing with an hps alone and the seedlings put all their growing effort
into height and not root/leaf which would eventually lead to them toppling over
more than likely. so i did some research and there was a source that confirmed that
an hps alone will just attract plants to want to grow towards it and nothing else but
that if you add the presence of a blue light source it will stop this. so i added a 10"
reflector with a blue grow light in it and sure enough the plants' leaves started to get
bigger and multiply and grow more laterally rather than vertically.
anyone else ever heard of this or has used a combination on a red/orange spectrum
light and blue spectrum ?
into height and not root/leaf which would eventually lead to them toppling over
more than likely. so i did some research and there was a source that confirmed that
an hps alone will just attract plants to want to grow towards it and nothing else but
that if you add the presence of a blue light source it will stop this. so i added a 10"
reflector with a blue grow light in it and sure enough the plants' leaves started to get
bigger and multiply and grow more laterally rather than vertically.
anyone else ever heard of this or has used a combination on a red/orange spectrum
light and blue spectrum ?
