Hey all I have been thinking of adding a second 400w HPs to my flower area, and I currently have one cooltube reflector for an existing 400w hps/mh. would it be possible and safe to hook two of them together with only one exhaust, I'd have an inline fan at the end of each reflector.

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I grow my bounty and spread it to those who need it. Johny law Won't stop my crop.

Hey dude, how ya been?
You can easily attach 2 lights to one fan, in fact one of our members does just that. I'm not sure which member, but I think it might of been iso2bwell.

The only point is, you can't use those home depot l'cheapo fans, you need a good canfan, coupled to a Y. hidhut has em.
Peace my friend

actually I was thinking more of single circuit strip of 2 lights, not parallel lighting

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I grow my bounty and spread it to those who need it. Johny law Won't stop my crop.

I may be stoned, but I am not clear on the question, if your asking if you can put
them on the same electrical circuit, than the answer is yes you can.

Running them in-line would cause the hot exhaust from the furthest end to "cool" the second lamp, causing it to run hotter. You might pull it off with a damn good fan (like a 4" or 6" Vortex) as it can draw enough air through so it doesn't heat up much as it passes the first lamp.

You could also offset them by about 6", and run the duct directly beside the other fixture (kind of like a fighter jet formation). The balance on the legs of the "Y" would not be equal, but you would be drawing cooler air through the fixtures.

Either way, enough air and I would go for it. Considered the same myself.

ISO

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I was going to get an 8" fan and put a reducer down to 6" to fit the reflector. The fan I have puts out 500 cfm, would this be enough for what I plan to do?

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I grow my bounty and spread it to those who need it. Johny law Won't stop my crop.

why not using 2 Y-pieces so that both lamps get fresh cool air but only one fan will be needed, or even simpler then this, cut the first Y and draw the air from the grow room it self...

but i would not run the air from one hot bulb to the next, the second in line wold get hardly any cooling then which reduces the bulb life harshly and add a big fire risk.

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Keep the gun oiled and the thumb green!

Yes, I like the "Y" idea too. No reason you can't do that.
500cfm is plenty good, so long as it is not one of those cheap home depot fans.

The home depot inline fan is a $30.00 over rated fan, there is no way it actually moves 500cfm. Look at the blades. A good 500cfm fan is gonna cost ya like 2 bills.

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actually I was gonna get a can fan from HTGsupply. and the reason I didn'y want to do a Y joint is because I'm not all that sure I have the space in my enclosure. since I am about to add another veg room in the same closet.

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I grow my bounty and spread it to those who need it. Johny law Won't stop my crop.

Here's how I've got my lights and exhausts set-up.

The 6" to 4" reducer you see there was home-made from a 8" plastic pot that I cut the bottom out of, then trimmed to shape at the 4" and 6" ends. Add a bit of duct tape and you have a very low cost reducer.

Flower room is 2 X 600W, and it is tough to keep that room WARM enough. The lamps ran all night, and it was 73 in there this morning when I checked the kids before they went to bed. A heater/fan runs in there all day (while lights are out) and keeps it between 63-67 during the sleep time.

There is no intake fan running in the flower room, as it draws air from the veg room when the lights are running (the Vortex is one powerful fan). I can damn near shut the door and seal it, and the fan will draw enough air through the intake fan (not operating, but in the wall) to keep it at 78-81 at plant-top height. (Ya, it gets cold here at night!)

Not sure if they will be of any help to ya, but might give you an idea or two. I'm with GP on the WAAAYYY overrating of the cheap can fans...I've got 5 of 'em here that will be used in emergency only. Noisy and ineffecient..says 500 CFM? Figure about 150-200 at best, IMHO.

ISO

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	flower intake103107.jpg (31.5 KB, 14 views)
	Veg Fan 2 103107.jpg (204.8 KB, 19 views)

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just like the first pix in ISO post is the way to go.it will cool both lights real good.ISO is right on with that setup. PEACE

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Anything I may say or do is stickly for entertainment only.This is all make believe and is not To believe by me or anyonehttp:\\www.greenpassion.org/f73/over-grow-government-ogg-2009-what-8722/

The secret to inline cooling of multiple fixtures is sourcing cool air to introduce to the system. Grab cool/cold air and it isn't going to heat up much through those tubes. Grab air out of a hot room and you will have some warm temps happnin in the ducting.

These are vented with a fresh/outdoor air source and a 737 cfm Can Fan and the heat is pumped right back into my house....

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Damn...that is a FINE set-up BT...I like how they are staggered a bit, too. I pump the exhaust from the 1000W MH back into the garage, and it in turnm warms the air there a bit...not much though when it's in the high 20's at night! Brrrr! Crap...it ain't even "cold" up here yet, but it does warm the garage up to the mid-40's, low 50's.

ISO

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thats awesome i wish i needed that many lights? :{

As a licensed med grower...I'm limited by plant counts...not by light count, blakeb!

So I figure...WTF? Let's ROCK N ROLL!!!

The config works well, ISO. 6- 600's over 8 plants in 5 gal DWC buckets. I'm a week into 12/12 and they are really starting to get with it on the stretch and on figuring out that...yup...it's time to make some BUD!

Big lights/big plants/big yeilds. I'm hooked.

Sawweet! I figured that 6 600's would be drawing about 36 amps. That's a chunk of amperage! Were you able to manage that without any electrical changes?

I've got 2 600's over 6 plants, and the coverage could be better. The plants are in there all snuggled up to each other...but since I'm in the 4th week of flower now, I am hoping they might be finished with the growing part.

Big or small, I enjoy the hell out of seeing stuff that folks took the time to take pride in designing it out and how it was all put together. It'll show in the end result!

ISO

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I had to make some additions to my electrical system to handle it all, ISO. In the end I ran a new 40 amp service and hooked 2 of the units pictured below to it....and they handle all 6 lights very nicely from one 120v timer.

baddaBLOOM......

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You can without a doubt run two 400's together like one big joint.....JUst buy the flanges or attachment to connect them properly and efficiently and your good to go..With a 500 cfm fan you would have no problem cooling three of these....At least I do......Cool tubes have 0 air restriction only the bulb slows air traffic a bit...Beiing that wee are working with predominately round bulbs ( DUH) air restriction is still like 0. I have a frient that has 4 600's linke together with a 6 something cfm fan and I would non hesitantly put my jewels against the glass......Hope this helped....