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why my 405nm dose this

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i had this blue violet diode from a philips blue ray dvd player forgot the model but got this part number ..
and of course im a newby . :)


and when i connect it to the driver it wont lasse .. pin out top +
mid not use which is
attached to base of
the diode.
bottom -
but when i connect the negative to the not used part ( which is the pin out connected to d base of the diode it lit up ...... pls help why is it........ tnx in advance :)

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