How much heat can a 150 watt hps give off? I want to do a rubbermaid stealth grow and ive been told they can withstand heat of 120 degrees or so. Anyone have any experience with this?

Bradly,

How much heat will depend largely on how the air circulation in your box is set up. Do you plan to have intake and exhaust fans?

ISO

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i will be using either 2 computer fans for exhaust or 1 bathroom exhaust fan and two 2inch passive intakes or if an actual intake fan is needed ill go that route. I think ill need to pull at least 100 cfm.

IF I were to grow in a Rubbermaid set-up I think I would place one 12v computer [exhaust] fan on each side of the top, that way any heat the lamp builds up gets sucked right out the top.

Plants can't take 120 degrees...IMO you want no more than 85-90 max at the top of the plants. I ran mine at as low as possible, generally in the mid 70's.

ISO

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iso hit the nail on the head...

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This is all fake, like the matrix it does not count i dont actully do any of this stuff. ifi loadid a pic i ound it on the cyber inter web space.

well when i am able to build my grow box i will definently keep that in mind

78 degrees is my magic number that i aim for. a 150watt light will probably raise the temp inside 5-10 degrees above the room level. this is why I have my thermostat max at 72 degrees. if you are making a rubbermaid grow box, a sheet of clear plexiglass under the lights can save your plants from some heat damage. it will only block a little bit of light, I used it under my 250watt in a small cabinet grow and it helps alot. good circulation and keeping the top of your plants away from the heat is the trick.

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I'm in a similar situation. So you guys think that with the proper ventilation you can run something other than CFL? I'm just worried about the plastic at the top where the light will be. I feel as if it will heat up far too much.

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i really like that plexi glass idea. In fact the light i was looking at says it can hold a piece of glass and the company sells it. I was not going to use the glass b/c i thought it would block to much light given its only a 150 watt but if will not be a problem then ill definently do this. thanks dieabetic

you can go to a local store like Ace Hardware or Home Depot and get the plexiglass sheet cut to whatever dimensions alot cheaper than buying it online

__________________

"Remember, you can never overdose - you can only under-dose. We are just making sure we aren't under-dosing."

I am a medical marijuana patient - my plants and use are covered under State Law. I do not endorse illegal activities in or out of the state/country. So don't tread on me.

Spring '09 Grow Chocolate Thai: http://www.greenpassion.org/showthread.php?t=7928

Current Fall '09 'Red Diesel' LED Grow http://www.greenpassion.org/showthread.php?t=14415

Dieabetic you are just a wealth of information. Thank You

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Disclaimer for any and all of my posts: I am in no way growing, smoking, dealing, or participating in any illegal activities. All posts are completely false. All posted pictures are fabrications of files found elsewhere

I, too, am considering the same route (that is, a 150w HPS for my Rubbermaid grow cab, remote ballast outside the box). With either a cooltube or an air-cooled glass-fitted reflector (more or less the same thing, save for shape), I'm wondering if the heat will be too much for the plastic above the lamp. Also, the foil tape lining is of some concern (worried about heat spots and plants burning), even though it would likely shield the plastic from some of the heat.

Anyone with a 150W HPS bulb burning have the temperature around it handy?

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"We'll work it out as we go along. Let our practice form our doctrine, thus assuring precise theoretical coherence."

Has anyone experienced chemical leakage from rubber/plastic if exposed to high heat and moisture?
Seems to me there would be some reaction as the rubber/plastic breaks down from this exposure.

Just a thought !

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I would be much more worried about high heat; moisture and plastic are a fairly inert combination (think plastic hydro setups - made out of the same containers we're growing in).

Plastic breaks down at a relatively low temperature, thus my concern with a 150w HPS. Not that CFLs don't throw off a fair amount of heat, especially in numbers, but at least it's spread out over an area exponentially larger than the area of an HPS bulb, reducing the amount of heat a given area receives overall.

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"We'll work it out as we go along. Let our practice form our doctrine, thus assuring precise theoretical coherence."

What about using a thermal tape like they use for racing headers, to protect the plastic above the bulb?

The main reason for glass over the bulb is for safety so if the bulb explodes the broken bulb will be contained in the lighting fixture. Also the glass is tempered as well. I have a 250 watt hid light and the grow room does get hot but I have a votex fan with a carbon filter set on a controller that turns the fans on at 80 and turns off after the temps drops. Works great!

high guys, i thought i'd jump in as i bought a couple of 150's for my new cab
and, while i haven't remoted both of them yet (i'm still working on the cab)
i did do one to test it after i got it.

so, from my own experience, i'd say it would be doable as long as you remoted
the ballast to the outside of the cab as was suggested by caerulipes,
although, if you haven't already built your Rubbermaid box, i'd suggest you
go shopping at your local Salvation Army or similar and look for a more
substantial, more permanent solution.

here's a couple of pics of my new, unfinished flower cab which i got for under
$50.00 USD at a Salvation Army. it stands 60 inchs tall, is 33 inchs wide and
19 inchs deep and i'm planning a DrBud style SOG using 1liter Smartwater
bottles as DIY pots. (it holds 11 rows of 5 bottles for a total of 55)

here also are a couple of the new mother cab i'm also working on, just an
old dresser i had laying around.

btw, if you do opt for the Rubbermaid, i'd strongly suggest you get a couple
cans of flat white spray paint rather than using the foil tape as you will
get hot spots with the foil.

keep in mind that while smoking weed isn't addictive, growing weed is!

so i guarantee, once you start smoking your 'own grown', top quality bud,
you won't be satisfied with the results you get from your Rubbermaid and
will definitely be wanting to upgrade.

either way, i wish you good fortune and if i can help, i'll do my best,

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