If the blue bulb consumes the same wattage as the OEM, blue bulb will always burn hotter than OEM. The color does affect the temperature. Light color reflects/transmitts heat better than dark color. If you wear black clothing in summer, you feel like in hell. That is why the "real cool" people wear white, not black.
There is an exhibit at Museum of Science Boston. There are two spot lights shining on two plane glasses. One is "clear" and the other is black, but it is still transparent. The object of the experiment is to have visitors put each hand on the each glass at the same time. The black is hotter than the clear. You can try this at home.
99 E430 Sport