What led chip is this?

LED Flashlights – General Info
1

Hello, im sorry if my english that bad.
My cree LED broken after it lasted 2 year.
I want to find a replacement about this cree LED, but i dont know which model this thing.

Here is the pic :

It shows “CREE” And the bottom is “J”

I zoomed this to see it clearly.

EDIT update
Finally i found it’s product box. here’s some information :

LED HEADLIGHT SPOTLIGHT
Voltage :
10V-95V (electric cars)
10V-25V (Motorcycles)

I just tried measure the voltage from driver to it’s led, and the result is : 51.2V (i plugged this to my ebike, which its voltage also 51V)

EDIT 2
it’s LED power 10W.

Can u guys help me? Thanks!

2

Well you need to post a picture of the emitter while turned off, so that we can at least take a look at the LED’s wires.

3

If this is a 16mm Board, it seems to be a XM-L2 (or a faked one).

4

Edit : here

5

It looks like a Cree XP-G2 led.

6

umm XM-L2 looks like this?

The PCB looks different than mine. my led looks like a complete circle PCB.

here’s some more pics

7

PCB has nothing to do with it. You can put an XM-L2 on any board with a 5050 footprint and dedicated thermal pad. That said I concur with djozz, that looks more like the smaller XP-G2 to me, but its hard to be certain without a close-up detailed photo of the LED so we can see the structure better. Like I said, ignore the board and focus on the emitter.

8

Ah right okay will going to take the close up photo. Will update later

9

Here, its my best close up possible with my camera…

10

Looks like a 16mm board with an XM-L2 on it.
Can’t tell if it’s a genuine XM-L2 or a fake one.

11

Hmm…By the way do u know XM-L2 tech specs? I tried to search on Cree’s website and found nothing :frowning:

Edit : found it. XLamp® XM LEDs Archives - Cree LED

im posting extreme close up.

12

Questions here :

i just found XM-L2 techspec on this : http://www.cree.com/led-components/products/xlamp-leds-discrete/xlamp-xm-l2

I’m new in LED technology, so i dont understand much.

I looked at this :

Im confused about led voltage. My led when i test it it’s 51V, but in tech spec said only 2.85V?

13

How do you test your LED?
I assume you made this thread because somethin isn’t working anymore.
If you have 51V on the LED, I would say that the driver is damaged (the thing inn the green wrapper).

What is this light out of?
it’s pretty dirty and the heatsinking is not really there, so maybe from a lawnmower or a work light?

14

Are you going to replace the LED or the light itself?

If the LED, just desolder the wires and put the board in a frying pan and remove the LED. This way we can see the footprint.

15

Looks like a real one, with the orange peel surface on the corners.
I can’t see if it has the 3rd bond wire (very thin gold wire) next to the die (the square with the yellow phosphor on top).
If it doesn’t have that, it’s a fake.

16

it’s Bike LED light. It’s pretty dirty because dirts from outside slip inside in small gaps. The product desc said that it’s weatherproof, but still dirt can manage to get in.

It’s not working anymore. The heatsink is not there because i just disassemble it

This is how i test my LED :

turn on, then attach test lead to it’s cable, and the reading will come…The led itself not turn on.
by the way, when i tried smacking the led to table (The led and reflector, not whole component smacked), suddenly it went on. But it doesnt last, only 2 hours and it poof again, and i tried to slap again it wont light up.

Im quite new, and thats all i do for this :frowning:

The only mystery is, 51V. If its over voltage, why it light up for 2 hours??

Btw, what LED do when you overvoltage it? instant kill or secure shut down?

17

The driver probably wont blow up the bond wires, but at 51V the LED seems to be not connected on one side reading the open output voltage

In any case the LED is connected to the wires the voltage wont go above 4.3V then the bond wires would blow by overcurrent

I would recommend heating the MCPCB and add some solder

18

51V on a bike lamp?

5.1V maybe - I assume you are using a batterypack or the dynamo of the bike?
Then 51V are just not possible.

19

We need more info on the power supply and the driver.
The 51 Volts seems a little unlikely.

20

Ohhhh yes it is!

I’ve got an old-style generator, the kind that rubs against the sidewall of the rear tire to spin, and 2 hotwire bulbs, front and back. Voltage is load-regulated.

When one bulb blew, it took the other bulb with it in a very short time once the voltage increased a lot at now only half-load.

Open-circuited, moderate speed, voltage shot up to over 60V! In fact, knowing that let me figure out how/why the remaining bulb went pouf so soon after the first one.