Just a few Qs

Hello all. I have a few questions concerning my setup. I have a 5L x 3W x 7H stand alone closet type thing, 600 watt HID. I need to know how large of a fan I would need to cool this light perfectly? Also I was thinking of adding a 250 watt HID in there also to help with the length of the cabinet so, I would also need to know the fan size for that also? I'm no good with math, so if you could "show your work" on how you figure the fan sizes that would be excellent.

I was also considering some side lighting and do not want to order online and wanted to know if T8 lighting would be any good? What's the difference between T5, T8, etc.?

I have a few more questions concerning fans and ventilation, but I'll wait until these are answered. Thank you in advance to anyone who might answer these questions.

Not good with math as well cant help... Might take a genious to figure this out...

Really just need help with the fan size for the lamps, two 400's I've decided to go with instead. How to install correctly cool tubes (size?), fan (size?), ducting all that good stuff.

I have 2 600 watt hps cool tubes.... My 6" can fan does a great job cooling both lights my ductin I also 6" and I use 6" clamps as well... Also Im thinkin that the diferance between the t5 and the t8 will def be the size and price... I own a t5 and it really gets my seedlings going... I can do a max of 10 seedlings under my t5 but I only vegge them under t5 for about 3 weeks... Then its time to go under my hps....... For ventilation I have a 6" can fan exaustin air out the closet then out the window it goes.... I have a low intake restroom vent that supplies fresh air into the room... And I have 2 18" fans makin the air in my closet circulate... 1 is placed right under the lights so that plant wont get direct heat from lights.... The othe one is placed at plant level.... My stems seem to appreciate all this air movement... My stems are looking as thick as my pinky at only 5 weeks of vegging..

Nice. So there's no extra lumen output or anything from a T5 that a T8 can't? What CFM is your can fan rated? Do you use a carbon filter? if so, what size fan is pulling through that or is it also connected to lighting system?

Nope,... No carbon filter yet... And I imagen that there will be more lumens if u use a t8 ratjer than a t5,... Since its bigger...
Not sure what the can fan is rated... And yes its 1 6 inch can fan cooling 2 lights...
When I start flowering is when I am gona need the carbon filter.... I might just end up rigging 1 up,... I did some research and I could spend about 40 bucks makin one... I am gona attach my carbon filter at the end of my 6" ductin on the exaust... I wont need a carbon filter on the lights since I have another 6" can fan that only cools lights and then the hot air is exausted out the window...

+rep if I earned it...

+rep for making me go look at the T5 - T8 differences.

I found..
T8 versus T5 Fluorescent: A Brief Analysis

1. What do the alpha numeric codes T5 and T8 actually mean?

Much has been made of the differences between T5 technology and T8 technology. I think it is wise to begin by discussing what T5 and T8 actually indicate. The letter ‘T’ in the lighting industry stands for “tubular.” This makes sense when one considers that fluorescent tubes are in fact tubular. The number directly following the letter “T” indicates the thickness or diameter of that particular tube in eighths of an inch.

T12 = twelve eighths of an inch in diameter or one and one-half inches thick
T8 = eight eighths of an inch in diameter or one inch thick
T5 = five eighths of an inch in diameter or five eighths of an inch thick
2. What have these alpha numeric codes come to mean?

As interest in energy saving technologies has grown and become popularized, these codes have come to designate levels of energy efficiency, instead of merely indicating lamp tube diameter.

Assumptions of Efficiency:

T12 = old and inefficient
T8 = higher efficiency
T5 = highest efficiency
Although, these assumptions are generally true, it is important to look at the application and determine the cost benefit of T5 over T8 in order to determine if the increased efficiency of T5 justifies the substantial increase in initial and long term maintenance costs

This is from/Find out morehttp://www.lightingsolutions.ca/index.php?option=com_content&view=article&id=25&Itemid=26

So, you win. You have the more efficient light. High.

I heard that the filters would have to be changed often on homemade carbon filters. Let me know how that works out for you though. If it turns out to be the cheaper method, shit I'll make one or two.

Im about to go into flowering in 6 days.... After veggin for 8 weeks... Still I have not made any filter.... Funds are kinda low after buying the canna coco bloom....

you are going to need the carbon filter m8, there going to start getting smelly, smelly enough to stink your full house and your garden lol, alot of people get caught through the smell.

p.s i would of bought the filter b4 the canna coco

As far as you fan size its measured in CFM with your room being 5x3x7 equaling out to 105 cubic feet you want a fan that will change the air every 2-4 minutes so look for something with a rating of at least 200+ CFM and you are golden...

t5 are brighter than t8. but t8 and t12 are available at nearly every store t5 are only at grow shops ive noticed