HPS VS. MH

[Zandor]

Howdy MajorBuds,
I have approxiamately 16 - 18 square feet,that I will be using to grow 4 plants in ,and if I divide 1000 watts by the square footage,that means that I'll have 62.5 watts per square foot,right ? If I add another 400 watts to that,it would jump up to 87.5 wpsf,isn't that too much light ? I'm worried that the 62.5,is too much..?

As long as you can deal with the heat at the top of your plants then more is better. With more light you can use Co2 and the plant will absorbe it even better. Just monitor the heat at the top of your plants with a remote temprature probe so you get a reading with the door closed.

Peace

Zandor Reviewed by Zandor on 03-16-2005. HPS VS. MH Hello, thought i would start a new thread with a question? Is (MH) absolutely necessary for flowering? :rolleyes: I read that HPS will do the same as (MH) And :eek: if i purchased a MH bulb at the depot and put it in the hps ballast will it work? I don't want to buy it if it doesn't work, or will i have to buy the ballast "just" for MH. Thanks for any advice from anyone. :o Rating: 5

[Torog]

As long as you can deal with the heat at the top of your plants then more is better. With more light you can use Co2 and the plant will absorbe it even better. Just monitor the heat at the top of your plants with a remote temprature probe so you get a reading with the door closed.

Peace

Howdy Zandor,

Thanx for the advice..I'll do just that,I have a digital thermometer with a remote probe,it also gives humidity readings as well. I'm wondering if a 5 gal bucket with yeast,will yield enough co2 to make a difference ? Thanx

Have a good one....

[Zandor]

Some say it does and any extra co2 is better then none. I used dry Ice for about a year before I could afford tanks, regulators and controllers to monitor the PPM level.

Peace

[smokejaguar]

Cool range vs warm range; blue vs red ; MH vs HPS;,, all this is fine tuning.As far as plants are concerned its all about ,The amount of lumens, and for how many hours.You can use any of these lights exclusively and produce excellent bud.Everything else is personal oppinion, not necessarilly substantiated by fact.-usdi Agaluga

[Zandor]

Cool range vs warm range; blue vs red ; MH vs HPS;,, all this is fine tuning.As far as plants are concerned its all about ,The amount of lumens, and for how many hours.You can use any of these lights exclusively and produce excellent bud.Everything else is personal oppinion, not necessarilly substantiated by fact.-usdi Agaluga

Dude are trying to say the color of the light does not matter and there is no scientific evidence to prove it does? Dude put down the crack pipe man it's doing bad stuff to you man.

That debate was settled over 20 years ago and light spectrum does have a profound effect on plant production.

If that is not what you are saying I apologies; but that is what it sounds like.

[smokejaguar]

In spite of what you think youve heard or read, all MJ cares about is total lumens and the light cycle.Yes research shows in the real world plants follow the natural progression of germinating, sprouting, and vegging under natural blue spectrum light.Later as they mature and the light spec shifts to red and then the cycle changes to 12/12 and flowering proceeds.This is the natural progression.However, you can produce good bud under total blue spec,or total red. Some prefer a combination.As a professional in the field of science you learn how to interpret information.Combined with 25+ yrs of growing, I know the effects of MH vs HPS is minimal in respect to the amount of lumens and the light cycle.Sweeping generalities rarely hold up.-usdi Agaluga

[smokinlowrider4u]

i have used both to flower i prefer hps but i found if you mixhps with halide or even floros it work nice..