ballast needed for 70w HPS?

but by the sounds of it you will definitely need to cool the room if you are trying to run 150watts hps in 18 square feet

damn man, its in the order that u said last post,

its about 3' tall , 2' wide, and 3' long

ive got a iso. fan in the shed blowing 24/7, will that be enough though?

do you know the CFM (cubic feet per minute) capability?

i dont think blowing the hot air around will do you any good,,, if anything try to have an intake and an exhaust in this 3x2x3 room,,, for circulation

well it says the CRI is 21.

thats all it said, 16,000 lumens and the CRI: 21

mrXgreenthumbX said:

well it says the CRI is 21.

thats all it said, 16,000 lumens and the CRI: 21

Click to expand...

CRI = Color Rendering Index. It's basically a measure of how accurately the light reproduces an objects color. It doesn't mean a whole lot for growing outside of photographing your grow. I believe CRI=100 means the light remains faithful to an objects natural color while lower numbers mean the color will be skewed.

What you're probably looking for is the color temperature in degrees Kelvin. A typical HPS bulb is in the 2100K range which is good for flowering and less good for vegging.

Hawk said:

CRI = Color Rendering Index. It's basically a measure of how accurately the light reproduces an objects color. It doesn't mean a whole lot for growing outside of photographing your grow. I believe CRI=100 means the light remains faithful to an objects natural color while lower numbers mean the color will be skewed.

What you're probably looking for is the color temperature in degrees Kelvin. A typical HPS bulb is in the 2100K range which is good for flowering and less good for vegging.

Click to expand...

ohh, well it doesnt tell me the K Temp. of the bulb.
im hoping for it to be around 2100k-3000k

but thanks man

What lamp are you referring to anyhow?

Like I said, a run of the mill HPS bulb is about 2100K. I'd bet 50 to 1 whatever HPS lamp you're looking at (16000L so that must be a 150w?) is about 2100K just like nearly all of these HPSs: http://www.e-conolight.com/Product/EProducts.asp?ProductFamilyID=22

If it's not 2100K it's a specialty HPS bulb.

in talking about this light right here :
http://www.e-conolight.com/Product/EProductDetail.asp?ProductFamilyID=7&FGNumber=E-MT5H151G

HPS under $50? Lowes has a 70 watt HPS for $30. It's in the light section where all of the exterior lights are.

There's also a guy on ebay selling 400 watt hps or metal halides (refurbished) for $60 + $25 shipping. For the $$$ is the best choice.

i know but i cant use it due to the size of area my grow ops in, and besides in only growing small amounts at a time (1-3 small plants)
and plus heat problems is another reason.

Hmm i was planing to put 400w HPS in 3w x2d x3h room. Guess if i do so i'll burn down !

if you dont take care of the heat properly yes, it will burn

id be worrying about a fire, with a 400watter in that smal of an area

it would be awfully hard for something to actually catch on fire from the heat.. paper doesnt even catch fire untill 451 degrees F... its more of an expression of burning the hell outta your plant

oh, i didnt knoe that,lol.
chuck, check out my grow, its my 2nd grow ever, shes a BEAUTYY

Thanks for the info <3

So do you think 150m3 per hour intake fan and a cool tube will handle it , and if so what distance from tops should i put it ? Cous my box is 105 cm tall :/
What should i go for 250w hps or 400w in my space .
Atm only with fan working the temp is 19C and RH is 50%
Its a basement so i think the temp will stay constant trough the summer.
My space is 60cm deep 105cm high and 90cm wide.
Atm i'm waiting for my seedling to pop , have 6 seeds of Hashberry wich acording to mandala is very heat resistant plant it's also most of it indica so i thing i can keep it low at high.