Lighting questions from the ever absorbant mind of bluelink88

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bluelink88

Member
if I gett a 400W hps that will be alright for all throgh veg and flower? Ive seem people post saying the use MH for veg HPS for flower or vice versa. will I be good? .... hypothetically if I was such person? :)
 
Eclypse

Eclypse

Active Member
In a nutshell without getting into specifics, Yes you can veg and bloom with HPS if that is what you must do.
 
xGanjaBabex

xGanjaBabex

Member
Hello. I'm new here and new to growing but saw your bump and the sparse experience I have with cannabis growing happens to include a 400w HPS/MH. I'll offer the information I have and if it's incorrect, perhaps it'll inspire a veteran grower to set me right.

The metal halide bulb is best used for vegetative state. The bulb I have has a color temperature of 6000K, which is very close to natural daylight and the color of the light produced by a metal halide bulb inspires our plants to grow, grow, grow.

The high pressure sodium bulbs often have color temperature of around 2200K, a yellowish color that inspires our plants to flower, flower, flower.

I used them last time in combination with the metal halide in my light during the vegetative phase, then I switched to the sodium light for the flowering phase. Perhaps I would have done better with more than 400w. I only had one plant, though, and it turned out to be a hermaphrodite. I'm not sure if that has anything to do with the amount of light the plant got, but I don't think it does. In any case, the plant seemed to do very well under 400 watts and was a dream effort until the plant self-pollinated.

Good luck, and happy light shopping!
 
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bluelink88

Member
i figured it was the kelvin rating that sets them apart. i just didnt want to drop 150+ on a MH and then another 150+ on HPS, but i guess i might have to for optimal growth and yield conditions
 
xGanjaBabex

xGanjaBabex

Member
What you can do is buy one light, then get a HPS bulb and a MH bulb. That's my set up; one light, and I just change bulbs.
 
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bluelink88

Member
running HPS all the way through a plants life cycle shouldnt be to bad, right? i mean, in a natural setting its not like the suns gonna change its spectrum for a flowering garden...
 
Eclypse

Eclypse

Active Member
It all has to do with the spectrum the lamp gives out. MH is better to be better for veg yes, but if money is an issue you will do just fine with hps right thru, so many people do it. Get a digital ballast, it will run hps/mh. Could get a dual spectrum lamp too so you only need one.
 
Eclypse

Eclypse

Active Member
bluelink88 said:
so any ballast and reflectors will hold both MH and HPS?
Click to expand...
The mogul in the reflector will hold any lamp. Ballast has to be dual, a digital ballast will do this for you. Look it up, get some basic knowledge, you will see most of the answers to the questions you are asking.
 
xGanjaBabex

xGanjaBabex

Member
bluelink88 said:
so any ballast and reflectors will hold both MH and HPS?
Click to expand...
My metal halide bulb that I got with my HPS light kit is a GrowBright 400w MH Conversion Bulb. The "conversion" is probably important when adding a metal halide bulb to a light designed for high pressure sodium.
 
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bluelink88

Member
Eclypse said:
It all has to do with the spectrum the lamp gives out. MH is better to be better for veg yes, but if money is an issue you will do just fine with hps right thru, so many people do it. Get a digital ballast, it will run hps/mh. Could get a dual spectrum lamp too so you only need one.
Click to expand...
very helpfull. thanks.
 
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