LED works only when pressing on die HELP

Flashlight Modding and DIY Parts
1

the light only turns on when i press hard on the led die,what is the issue here,
is this normal, am i missing something.?
here is a video https://youtu.be/MVQrIl1GCLQ
here is the datasheet for the LED http://www.bridgelux.com/sites/default/files/resource_media/DS23-Bridgelux-ES-Star-Array-Data-Sheet1.pdf

thanks for any help

2

COB LEDs are not to be pressed like that, have you had any success running the light at all before? Is it the correct voltage/amperage and are the leads properly soldered on?

3

Looks like a problem with the COB itself…

4

Try reflowing the emitter.

5

ive never ran this led before, voltage and amperage are correct, the leads are soldered on correctly from what i can tell,it does have two more -+ on the board, see attached.
i also have another one of these led’s and it does the same thing…could be be just a junky unit?

6

reflow?
im fairly new to LED’s and learning as going

7

I don’t think you can reflow these COB LEDs, at least not the newer ones I have. The picture you posted shows (or I believe it shows) how the emitters are under the surface.
Some COBs I have flicker or don’t work properly if not mounted on a heatsink, but I think we can exclude that hear since they don’t work at all unless pressed.

8

@thrglider, you’re really unlucky, are you?

Seems the COB array has not been soldered down properly.

You will have to ask for a refund/reship.

9

thanks for all the great info,yes unlucky seems to be the situation, thanks again for all the great help :slight_smile:
i will get cree perhaps or if any of you can point me to the right direction for an led that is reputable