Thread: Ultrafire WF-501 B works with flashing mode Cree XLamp dropin: Closups & beams.
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Old 07-24-09 | 01:52 AM
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Originally Posted by Giro
There are some differences in the mounting of the LED to the PC board. The stock module I got has some hard white glue beneath and extending out from under the LED (see photo) Anyone know if this might be thermally conductive epoxy?

In contrast, the Cree drop-in does not have anything extending out from underneath but is very close to the PC board. (see photo). I'm uncertain if it actually touches the board but I could not slip any of some 0.003" plastic film underneath the LED. Any comments on this heat-sinking vs. the stock?
The white stuff is thermal epoxy of some kind. The cree is reflow soldered to the white "star" board below it, this board will likely have thermal epoxy under it.
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