choosing a floor fan to blow straight up at bare bulb

[stonestone]

i need to buy some floor fans to place under 1k watt hps bare bulbs..

the lamps are one a flip flop box on for one hour off for one hour to avoid hott spots.
adding floor fans should help with this a lot!
my question is which fan to go with?

http://www.homedepot.com/webapp/wcs...&productId=202795625&R=202795625#.UIMynW8rXzk
(largest, by a lot @ 3150cfm)

or stanley blower (not sure that blows str8 up)
http://www.homedepot.com/webapp/wcs...&productId=202795625&R=202795625#.UIMynW8rXzk

or are thos both overkill
http://www.homedepot.com/webapp/wcs...ll;fan;202182997-_-202020283-_-N#.UIMzb28rXzk

thoughts?

 

[bowlfullofbliss]

why not just air cool your light and not turn it off and on? The act of turning them on and off is the hardest part on a lamp, you're going to burn them out much faster this way, and confuse the hell out of your plants. Does the sun ever turn on and off to avoid hot spots? lol.

I have 3 of them and no hot spots

 

[stonestone]

i get more coverage flipping them. twice the number of lamps with a small electric bill.
the sun moves around in the sky and behind clouds.. as long as the room is lit for 12 hours/dark for 12 plants won't get confused..
it is hard on bulbs and ballasts true...

 

[stonestone]

anyone know the ideal amount of cfm?

 

[OGEvilgenius]

I have a cheapy 15 dollar honeywell like your 3rd choice. I also have one bulb without a fan at all (also looking for another, but wanted to test) - doesn't seem necessary if you're exchanging your room's air constantly.

Go with the 3rd option.

 

[smoke and coke]

your link for the stanley blower is wrong. i have a stanley blower i use for an exhaust. you dont need a huge fan to blow up at the bulb. go with the small 10" a long as it can be turned to blow straight up.

this is not my pic but i did try it and it qorked great. it does blow the heat away from the bulb and the plants, but it also warms the whole room where a cool tube would just take the heat staright out.

 

[wawa007]

anyone know the ideal amount of cfm?

hehee whats up bro i c by the homedepot site that ur store is in berlin heheheh im from new britain it's nice to c someone from around me neways u ask about cfm wright , idk how big ur grow space is but this is how u count cubic feet , u taking width times length times height so lets sey the width is 6 feet ur length is 8 feet and the height of the room is 8 feet so 6x8x8=384 cf and now u wanna know how fast u wanna move the air , lets say 5 min do u divide ur cf by 5 ... 384:5=76.8 cfm and that's how big of the fan u want but in case of vertic i would calculate the cubic feet of my grow and move that much air a minute because u don't want no heat build up in ur vertic at all , I start building my own vertic but my light's r cool tube so i,m going to vent the heat out straight from them so my room stay cool ... good luck to u man

 

[Clown Baby]

the lamps are one a flip flop box on for one hour off for one hour to avoid hott spots.
?

This is going to ruin your bulbs.

 

[iadburner]

hehee whats up bro i c by the homedepot site that ur store is in berlin heheheh im from new britain it's nice to c someone from around me neways u ask about cfm wright , idk how big ur grow space is but this is how u count cubic feet , u taking width times length times height so lets sey the width is 6 feet ur length is 8 feet and the height of the room is 8 feet so 6x8x8=384 cf and now u wanna know how fast u wanna move the air , lets say 5 min do u divide ur cf by 5 ... 384:5=76.8 cfm and that's how big of the fan u want but in case of vertic i would calculate the cubic feet of my grow and move that much air a minute because u don't want no heat build up in ur vertic at all , I start building my own vertic but my light's r cool tube so i,m going to vent the heat out straight from them so my room stay cool ... good luck to u man

Umm... I think that's just your local store. The site shows my local store as well...

 

[Nizza]

Calculating Fan Requirements

 

[legallyflying]

I used a honeywell and it worked pretty good. I would NOT get that big stainless fan, that is going to dehydrate and beat the hell out of the leaves. Another member that kills it on a regular bassis uses simply wall mart box fans set up on some wooden blocks. Really liked that idea. Not sure if he is using standard box fans which are about 2 x 2 or the smaller "RV" box fans.