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Philips X-treme Ultinon 7443 Red LED Rear Brake Bulbs (my review pending!)
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But, FR-S and BRZ already have LED brake lamps
I'm just kidding. I love quality LED reviews as a fellow lighting nut.
In fact, I just got a pair. Here's my comparison photo of the X-treme Ultinons (had to buy from Japan again) against the commonly available (even Walmart sells them!) Philips Red Vision LEDs on my Impreza.
Did you know Philips 7443 LED bulbs work in both Standard and CK wired sockets? After thinking about it for a while, I believe I figured out how that works:
Consider the arrows as diodes and for the orange arrows, combine their outputs and then put the LED+ on that, with the LED- going to the shared end point of the arrows.
Most 7443 LED bulbs don't work in both types of sockets. I've seen some that are made of two entirely independent polarity agnostic circuits, but I think that's wasteful engineering.
I think I'm done with LED car bulbs now. I'm totally satisfied with the Philips X-treme Ultinons (7440 Amber + 7443 Red+Red).