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[Solved] Best Heat Sink Size for 50Watt LED Diode Floodlight: Aluminum Radiator Dimensions & Tips

pkpintercity 7710 6
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 17071469
    pkpintercity
    Level 13  
    hello 50watt leds came to me. and wants to build a floodlight in front of the garage. I bought a halogen lamp to have it ready, I fired everything and cut a hole for the diode. diode screwed to the aluminum radiator dimensions I give the eye now 100x300mm I could be wrong I gave thermal paste and I twisted everything. the diode is on 230v I turn on elegant, but a 3-minute heat sink passes. and now, question, what size should I give the heat sink ???
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    #2 17071498
    pawlik118
    Level 33  
    Do you have documentation for this diode? If so, see what is the maximum permissible temperature of the diode housing. If you do not have documentation, then you need to take roughly 70-80stC as the maximum diode heat sink temperature. Assuming that the lamp is to work at temperatures up to + 30stC, then dT = 80-30 = 50K (K - Kelvin = stC). For a 50W diode power, the heat sink should have a thermal resistance of no more than: Rt = 50K / 50W = 1K / W. The first better heat sink from TME that meets these assumptions: https://www.tme.eu/pl/details/sk120_150_sa/radiatory/fischer-elektronik/sk-120-150-sa/
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  • #3 17071554
    pkpintercity
    Level 13  
    oo thank you very much. how it calculates exactly will be useful for the future. I do not have documentation. will it be suitable ??
    https://www.olx.pl/oferta/radiator-CID99-IDpyxtj.html
    and the question is whether this also will be useful ???
    https://www.tme.eu/pl/details/sk135_100_sa/radiatory/fischer-elektronik/sk-135-100-sa/ also has 1k / w if it is so that then the area is calculated.
    I managed to dig out such heat sinks, maybe I will find something else if these are suitable? Best Heat Sink Size for 50Watt LED Diode Floodlight: Aluminum Radiator Dimensions & Tips
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    #4 17071886
    pawlik118
    Level 33  
    You can do tests in a working system - i.e. you connect everything and measure the temperature at the contact point of the LED with the heat sink. Then dT = Radius temp. - Ambient temperature should be determined that should be less than 50K. Generally, for the highest ambient temperature (around 30 ° C in summer) the temperature of the heat sink at the diode should not exceed 70-80 ° C. Everything is approximate.
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    #5 17073905
    _jta_
    Electronics specialist  
    Have you used thermal grease suitable for 50W LED? Have you checked the LED catalog note, what are the requirements?

    The heat sink temperature of 70 ° C does not mean that the LED housing will have up to 80 ° C - it can have a lot more, it depends on the contact of the LED with the heat sink.
  • #6 17081844
    pkpintercity
    Level 13  
    so I gave paste with the addition of silver. Unfortunately, I do not have a catalog note because I bought it online. but I used the radiator from the photo on the right side was heating up terribly and I gave the probe a PC fan and the temperature is only slightly warm, as well as the diode and the radiator. And, question, what paste do you recommend ??? only the fan on 12v diode on 230 and I have to put somewhere luck or a small charger
  • #7 17794708
    pkpintercity
    Level 13  
    adding a fan from the computer turned out to be the golden mean and the temperature is optimal
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Topic summary

The discussion revolves around determining the appropriate heat sink size for a 50W LED diode floodlight. The user initially used a 100x300mm aluminum radiator but experienced overheating after three minutes of operation. Responses suggest checking the maximum permissible temperature for the diode, with a recommended heat sink thermal resistance of no more than 1K/W. Various heat sink models were proposed, including those from Fischer Elektronik. Users emphasized the importance of using suitable thermal paste and suggested conducting temperature tests to ensure the heat sink remains within safe limits. The addition of a computer fan was noted as an effective solution to maintain optimal temperatures.
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