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Thread: How much difference does aircooling led bulds make, lux output and lifespan?

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    Default Unanswered: How much difference does aircooling led bulds make, lux output and lifespan?

    Been having some great results from Philips led bulbs but I want to get more out of them, I don't know how accurate this chart is.
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    but from what I have been reading and seeing this chart is leading me to believe, if i build a led hood(8 bulbs), add 2 x 120mm fans and channel the air flow onto each led, this will reduce the leds running temperature, I used a fridge thermometer with a wire and stuck it to the side of the bulb, it hit 45c(room temp 23c)with a fan directly on the bulbs, I should be able to reduce the temps by 10-15c and this will increase the lux output by 10-15%

    The fans/ parts for the 4 led hoods are going to cost just over £100 but again from what I read, reducing the running temps will increase the life span of the bulbs.

    Do you think can work or is it a waste of time/money?

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    Sounds like it could work, but then you'd have to work out if the cost of the fans and extra power would be worth the extra 10-15%.
    Might be cheaper and less work to add another bulb or two?

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    Quote Originally Posted by DoinkBrah View Post
    Sounds like it could work, but then you'd have to work out if the cost of the fans and extra power would be worth the extra 10-15%.
    Might be cheaper and less work to add another bulb or two?
    I was thinking the same thing but the fans would be great for the canopy, even air flow over the whole canopy, how much longer would the leds last? (guessing I need to replace them every 12 months, maybe I could get 2 years out of them if there air cooled)
    The fans should last 5-8 years, (60,000 hours), they only use a few watts, less than 10w for all 8, 120mm fans
    Last edited by CheapHomeGrown; 26-05-22 at 07:36 PM.

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    Will 120mm pc fans be powerful enough to overcome your outtake fan and provide an airflow in a negative pressure room?

    Don't forget to allow for the pc fans start up power requirements, its more than they require to run.

    8 120mm fans at 10-25dB each makes a racket, if noise is a consideration its something to think on.

    Noctua Nf-P12 redux 900 are 12.6dB. Provides 1,21 mm H2O Static Pressure.

    Noctua Nf-P12 redux 1700pwm are 25.1dB. Provides 2,83 mm H2O Static Pressure.


    What are you going to use to run the fans? PSU? Fan controller?

    For that little return I would probably just buy a floor fan, hang it from a ratchet pointed at the bulbs, less wires, less hassle, less overall noise, easy change over if required
    Last edited by Mac; 27-05-22 at 04:16 AM.

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    Thanks Mac,
    you have some valid points,
    1. airflow PC fan not powerful enough, going to replace 2 fans with one
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    2. The fan wattage is low, don't this will make much difference(pc fans start up power requirements)
    3. noise level, each fan can be boxed in to reduce the noise level and there spaced out even, more worried about one large fan in one corner of the room.

    I could use a light dimmer to control the fan speed if there too load.

    One large fan 65db in the corner vs 4 fans 36dB, spaced out every 2ft, guessing the 4 fan make less noise over all.
    Last edited by CheapHomeGrown; 27-05-22 at 08:24 AM.

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    If your filter is up buy the lights stick a clear piece of perspex under them & a fan blowing across the perspex towards the filter.

    I think your talking single digit percentages between running cool & hot & unless you’re struggling with temperatures it’s probably not worth the aggro (IMO)

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    Quote Originally Posted by B1unt View Post
    If your filter is up buy the lights stick a clear piece of perspex under them & a fan blowing across the perspex towards the filter.

    I think your talking single digit percentages between running cool & hot & unless you’re struggling with temperatures it’s probably not worth the aggro (IMO)


    Good point blunt, but I think the room will run hotter with extra bulbs and fans(watts)
    The idea behind cooling the bulbs is to make them more effective(lum output) and get them to last 2-3 times longer as I believe led are designed to run hot. so they last the right amount of time(so i keep buying them every year), the colder they run, the longer they last, if I was to pull the bulb apart and stick it on a heatsink with a fan it would probably last 10 years before it drops to 80%(effetive)

    I could add Thermoelectric Cooler to the heatsink and the leds would run cold and put out 30% more light.
    Don't know how effective Thermoelectric Cooler are. But along as the Thermoelectric Cooler run the leds could last 30 years( crazy when think about it)

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    Where did you get the figure “30% more light” from?

    If you have a par meter app or lux meter, put it under the light & fire them up, see what the initial reading is when they first fire up cold. Go get high, forget about it, come back 4-24 hours later & see what the level has dropped to.

    Interested to know what the percentage difference is

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    Quote Originally Posted by B1unt View Post
    Where did you get the figure “30% more light” from?

    If you have a par meter app or lux meter, put it under the light & fire them up, see what the initial reading is when they first fire up cold. Go get high, forget about it, come back 4-24 hours later & see what the level has dropped to.

    Interested to know what the percentage difference is
    Evening B1unt,
    The chart at the top of the page, if I use 2700k bulbs(red)45c looks about 75% so knocking the temps down to 30c making them 110% give or take if the chart is correct.

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    I forgot to add this article
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