Under the gel and phosphor of a COB LED car lamp. (Deep violet chips)

I was given a couple of these lamps by a local friend called John. They're fairly standard push-in vehicle lamps with a protective gel forming the lens. That can be picked off and reveals the phosphor, which can also be carefully picked off to reveal deep violet LEDs.

If you try this and accidentally detach one of the chips like I did, then you can solder over its tiny pads to bridge it out and get the others to light at a reduced supply voltage.

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