Minimum size fan for 1000 watt aircooled fixture

[JG's Ghost]

Hi Folks:

As the title says what would you say is the minimum cfm size to cool a 1000 watt air cooled reflector?

Also I would like to know if there is any type of controller that will switch a fan's speed from full to half speed?
Needless to say I want the fan attached to my scrubber to be running full speed, or close to it when the light is on, but would like to slow it down during lights out.

Any suggestions would be greatly appreciated.

JG's Ghost

 

[zor]

when the light is on, i think a vortex 6" or ~ 500 cfm would take care of it. ive never seen a light controller that turns down during lights off.

however, in order to efficiently use the fan (more cfm when lights are on), many use 2 separate fans. one to cool the light. and one to cool the room / scrub the air

 

[JG's Ghost]

I will be using two fans just as you describe.

What I'm looking for is a controller that would drop the scrubber fan to half speed, maybe even a bit less when the lights are out. I have a 750 cfm fan for the scrubber, and am looking to buy one for the light.

I have seen the ductstat controller, but was hoping there might be something out there that would just drop the speed of the fan after lights out without dealing with a thermostat.

Thanks

JG's Ghost

 

[gdbud]

I would think if you had a two speed fan and a transducer that would sense the current for the lights then to a relay that would switch between the two different fan speeds.
For something like this I would look at HVAC equipment and controllers. Grainger.com

 

[ThePizzaMan]

You can get a speedster speed controller for like $20 and just do it manually. I am not really sure why you would mess with the speed of your scrubber fan. You should have that thing singing 24/7. The energy consumption for one would probably be nominal.

 

[JG's Ghost]

Really!!??? Well that solves my problem then.

I have a dimmer for the fan already so all I gotta do is dial it in for lights on, and that's it.

Thanks

JG's Ghost

 

[KONY]

There is definitely controllers that allow you to set day and night time temps and it automatically adjust the fan to try to obtain these temps.... think they are around 100$, cap makes ones.

The original question, a 6" inline fan will cool 1000 watts no problem. I dont think I would bother with anything smaller. NOTE: don't try getting a 6" duct booster fan... you need a real fan. At the very least a cap valuline 6".... if u got more money get a can or vortex.

 

[the gnome]

I have a elicent 6" inline, its rated around 316cfm, its on a controller.
it cools my 1kw lamp in a cooltube just fine and it will cool two I'm sure.
the controller is set at near 70% power

 

[Cannarado]

You would want to turn down fan temps at "night" if persay the night temps drop to low you would want to slow the fan.

Personally... i would just thermostatically control it. I also recommend just getting a Tjernlund. 530CFM, all metal, quality fan with TONS of power! Oh and did i mention it costs under $100 shipped?

Do not try and DIY a controller like you planned. Buy a cap, or thermostat control it. The problem with this is it CAN shut OFF your fan allowing fresh stank air to escape possibly. I would recommend two fans that way. but i personally just bought a Dial a temp and set and forget!

 

[ShroomDr]

I use a stanley blower ($40; 3 speeds) to pull air though my 6" suntube 1000w HPS, and another to cool a 8" cooltube with (2) 600w HID's.

You can wrap a standard horizontal reflector with insulation, trapping the heat inside, and preventing the metal from radiating a substantial amount of heat energy into your environment.