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Thread: cree solder points / ceramic base temp

  1. #1
    Flashaholic aljsk8's Avatar
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    Default cree solder points / ceramic base temp

    could someone tell me the max temp for the ceramic area or the top solder points on a cree xre

    i have a chanel of aluminium with 3 warm white (q3 5a) cree xre's on it
    direct driven (resistored) from a 12v sla the voltage of each led is around
    3.5v when the sun has been charging the battery up to max (2w solar panel charges the battery and keeps it topped up)

    after about 10mins the ceramic and solder points are at 75C and then stay there and drop as the battery runs out hours later

    i know max junction temp is 150C but for obvious reasons i cant measure that

    also what lumen loss am i getting at this temp

    any help would be great

    Alex
    Lights - Not enough

  2. #2
    Flashaholic aljsk8's Avatar
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    Default Re: cree solder points / ceramic base temp

    nobody? really could do with some help on this one

    thanks

    Alex
    Lights - Not enough

  3. #3
    Flashaholic aljsk8's Avatar
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    Default Re: cree solder points / ceramic base temp

    nobody

    could really do with some help here

    thanks

    Alex
    Lights - Not enough

  4. #4
    Flashaholic
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    Default Re: cree solder points / ceramic base temp

    Nobody probably knows because nobody knows what the thermal resistance from that part to the die is.. A heatsink temperature next to the emitter would be give approximate results (Cree has thermal specs on their datasheet) but is still slightly dependent on how you applied thermal compound(and if you applied any) and the specs of it.. One way to measure the temperature is the measure the voltage drop.. I think there is a thread on finding it somewhere around here...

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