6" or 8" Cooltube? +rep

I am looking to order the 600w switchable HPS/MH ballast with a 6" Cooltube reflector. However, i realized the MH bulbs are a little wide. Will wide MH bulbs even fit in a 6" Cooltube? If so, do they restrict air flor at all? Do the 8" Cooltubes give better air flow and cooling, even with an HPS bulb in them?

I am going to be using a 6" inline fan(435cfm) so i would like to use the 6" reflector, but i could always get a 6" to 8" converter.

+rep for good answers

Personally I think MH lamps are a waste of money anyways. HPS lamps offer a greater spectrum which is closer to the sun, MH lamps are in my opinion under powered and don't offer a wide enough spectrum for maximizing your plants potential. Go 6" cool tube w/ a 600 watt HPS for veg and bloom. Saves you $$$ and is better for your plants in the long run. HPS bulbs also come in full spectrum which will be even better!

i have 6in cooltubes, i use switchable set up.mh/hps depending on what stage im at. i dont know if a regular mh bulb fits, i use a hortilux blue (mt400d) for vegging. its almost as narrow as my 1000watt hps bulb which fits in my 6in tube.

ideally the cool tube would be as close to or equal to the diameter of the duct, i would think

The bigger the are in the tube the less heat your light builds up.My 6 inch tube was too small for my 600s they got too hot in that little space.Id use the 8 inch tube.That internal heat is what blows bulbs premature..peace

From a big picture standpoint,

I would say get the 8" incase you upgrade later and need more air flow for temp. Go big or go home is my policy. But again, if you know your never going to a 1000w then stay with the 6" and reserve the cash for the duct reducers.

Plus duct reducers fit like shoes; Every brand fits differently. ( some just don't freaking fit!)

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supernovagrowlights said:

Check out my site before you buy any lamps www.supernovagrowlights.com are prices are super low but enter supernova as coupon code at check out to save another 5%

if you decide on a lamp that is not listed shoot me an email at [email protected] and i'll price them out for you

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supernovagrowlights said:

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