You need LED's in order to get a consistent and long-lasting solution. The GP Thunder or any other bulbs will eventually discolor and/or burn out.

Also, I don't think there is any solution available today that will provide a brightly-lit angel eye during daytime.

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11' X5 35i Sport Activity - AW/Blk/Alum
06' Subaru Legacy GT - GONE
05' BMW X3 3.0 - GONE
01' Honda Prelude, modded - GONE