kelvin rating question

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nocturnalreef

Member
i have a few extra 400 halieds laying around.. the only thing is they are 20k radium bulbs... does anyone know what kelvin ratings are okay for veg growth? and if a 20k bulb would cause slow growth or defects at all?
 
Indoor Don

Indoor Don

Active Member
nocturnalreef said:
i have a few extra 400 halieds laying around.. the only thing is they are 20k radium bulbs... does anyone know what kelvin ratings are okay for veg growth? and if a 20k bulb would cause slow growth or defects at all?
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are you sure its 20k? 6500k is best for veg, 2700k for flower, but i never heard of 20, but i'm not a pro.
 
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burninjay

Active Member
Heres a graph of it's spectrum output. Will stimulate photosynthesis if you don't have another bulb, but a MH in the 5000k range would be better.
 

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N

nocturnalreef

Member
yeah it's a reef bulb it's actually a 20k radium.. not just a 20k.. the radium is a CRAZY blue mixed with a purpleish hue.. my ballast runs 2- 400 --20k radiums, -----any halied and HPS so i can do whatever but i had the bulbs sitting here and i have an idividual 20k radium ballast that is sitting also so i figured why not... but i didn't want it to just work.... i wanted it to be a good grow bulb...
 
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jnuggs

Well-Known Member
I read a thread once of a guy who vegged with the 20k, and had another grow beside with a normal 6,500 rating, and the 20k grew a bit faster.
 
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nocturnalreef

Member
jnuggs said:
I read a thread once of a guy who vegged with the 20k, and had another grow beside with a normal 6,500 rating, and the 20k grew a bit faster.
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i bet no idea if it was on this site or not do you? if you can remeber the site or find a link to it i would appreciate it... i was actually going to run a 20k and a hortilux blue eye in the same area as a dual mix thing and that thread would be great.. i just wanted to make sure i didn't screw up their growth or make them go south in anyway.
 
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nocturnalreef

Member
does anyone know if i put a halied and a hps to mix colors would that enhance growth in anyway with the 3500k and hortilux blue mixed light? i run a dual 400 ballast that runs anything( as said before) so i just wanted to see if there are any good color mixes with two bulbs to speed or enhance growth
 
tobikan.judan

tobikan.judan

Member
bumb this thread. I'm curious also. I'm going to have a 250watt MH system with 20k kelvin bulb, and 2 96w T5 flouro's.


Will this work well for veg?
 
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