I, too, recently tried the LED 3157's and was very disappointed. Unlike PhilD, I really wasn't concerned with the way the 12 LED bulbs looked in the housing as I was with the light output and the color of the light. The color is excellent for matching the Sylvania HID's but there just is very little light output, negating the need for the lights all together.
I have some bulbs on the way that have been on backorder that are supposed to have the HID look (blue coating I'm sure). I am hoping that they tie the light color together with the HID headlights and still produce usable light. I'm not sure if they are the same bulbs PhilD is using or not, but I'll report on them as soon as I receive them.
By the way, the base of my stock 3157's were cooked to some degree. There was some minor melting to the base and the bottom of the glass bulb was blackened. Again this was the stock bulbs.
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