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  1. #1
    Senior Member ThisGeekyChick's Avatar
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    Need to mod light - add fans..

    Have a 24" T5 - 150 watt MH combo that does not have any fans. Can't have the MH light on for more than 40 mins before the tank starts to overheat.
    It looks like there's space on either side of the MH fixture for fans, how hard would this be to do? Let me know what you want pics of and I'll post em.
    Resistance is futile, you will be assimilated!

  2. #2
    liv
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    can't be too hard to setup.. but i suggest you put them not in the fixture but directly on the sides of the tank blowing air directly at the water across. will be more efficient. ( you are trying to cool the water, not the lights

    moving.. so temporarily out of SW :b8:
    planning next tank, possibly 60x30x20 on 2x plasma.
    updated: 2011/05/30

  3. #3
    Senior Member ThisGeekyChick's Avatar
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    That makes sense Liv..Would a couple of PC power supply fans work?
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  4. #4
    Former Moderator a4twenty's Avatar
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    they should work fine, lots of people use them in a canopy for cooling and the DC is safer around the SW.
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    120S RR tank with 60G basement sump / fuge

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  5. #5
    liv
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    absolutely.. they work great and are dirt cheap too.
    I use 4* 5" pc fans to cool down the water & I use 4* 3" pc fans for the t5ho.
    works great.
    I also find them alot quieter when not at full speed. so I usually run mine between 8 to 10volts instead depending on the fan size.

    moving.. so temporarily out of SW :b8:
    planning next tank, possibly 60x30x20 on 2x plasma.
    updated: 2011/05/30

  6. #6
    ijo
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    I setup one of these fans on my wall tank without issues... I connected the power supply to the same source as the lamps so that they only turn on while the lamps are running... I also went though the hood but would of went on the sides if space permited.

    IJO
    Attached Thumbnails Attached Thumbnails Need to mod light - add fans..-fan_top.gif   Need to mod light - add fans..-fan_bottom.gif  

  7. #7
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    I have 2 small DC computer fans per MH. blows across the water directly under the MH. My tank temp immediately drops when the fans are called. works amazingly well. I do not hear a sound when they're on. Even when I'm directly infront of them looking at my tank.
    120g AGA~145 lbs Haitian LR~DA Reef Keeper 2 Controller~Dual 14k 250 DE MH's~Dual Overflows~Dual 250w Jager Heaters~Dual 96W Actinics~30g Sump/Refugium~Mag 12 Return~140 lbs Reefgrade Caribsea Aragonite~BubbleKing 180 Skimmer~Phosban Reactor~GEO Kalk Reactor~Powerheads:MP40w/Seio 820/modified Powersweep 270 with Hydor rotating deflector~Digital lighting timer for moon/fuge lighting~7 stage RODI filtration~Quarantine: modified 12.5g Marineland Eclipse

  8. #8
    Senior Member ThisGeekyChick's Avatar
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    Cool! Thanks everyone
    Resistance is futile, you will be assimilated!

  9. #9
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    Quote Originally Posted by IJO View Post
    I setup one of these fans on my wall tank without issues... I connected the power supply to the same source as the lamps so that they only turn on while the lamps are running... I also went though the hood but would of went on the sides if space permited.

    IJO
    I'm curious, were you using 120V AC fans, or PC fans @ 12V DC?... I wouldn't think there would be any low DC voltage available inside a MH/T5 lighting fixture...

    Thanks,
    Richard.

  10. #10
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    Quote Originally Posted by YukonDude View Post
    I'm curious, were you using 120V AC fans, or PC fans @ 12V DC?... I wouldn't think there would be any low DC voltage available inside a MH/T5 lighting fixture...

    Thanks,
    Richard.

    Most of us all use DC fans, which are quite common, since many computers can have easily have over 3 alone... They're more easy to control speedwise, and safer around saltwater. I wouldn't worry about cooling the inside of the fixture. If the fixture was built without a fan, it can handle its own heat without needing cooling. You want to concern yourself with the excess heat being directed to your tank, right at the surface of the water. This is where you want it to blow....
    Also, my fixture has a built in cooling fan that does absolutely NOTHING for keeping my tank itself cool, it just keeps my fixture cool.
    120g AGA~145 lbs Haitian LR~DA Reef Keeper 2 Controller~Dual 14k 250 DE MH's~Dual Overflows~Dual 250w Jager Heaters~Dual 96W Actinics~30g Sump/Refugium~Mag 12 Return~140 lbs Reefgrade Caribsea Aragonite~BubbleKing 180 Skimmer~Phosban Reactor~GEO Kalk Reactor~Powerheads:MP40w/Seio 820/modified Powersweep 270 with Hydor rotating deflector~Digital lighting timer for moon/fuge lighting~7 stage RODI filtration~Quarantine: modified 12.5g Marineland Eclipse

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