CEL is usually for euro cars which measure resistance to know if a bulb burnt out. "normal" jap brands don't have this.

also +1 on option 2 esp. camera na lang kulang. baka nga di na rin kailangan ng LED bulb

I'm using this type (no side-LEDs):


It's brighter than stock, but not necessarily better since focused yung beam padiretso instead of being scattered. Personally, I find it helpful since I can estimate the distance of a wall through the projected "circle" beam. I've also tried the non-projector LEDs, they're useless haha.

Btw, check that your tail lamp reverse doesn't have a diffuser. Otherwise, useless yung projector ng LED