Blue light look bright because the eye see it as glare.

A bad choice - especially for oncoming drivers.

See here: http://www.danielsternlighting.com/t...blue/blue.html

From the unacceptable blue globes section:

Blue bulbs have colored glass (or a filter coating applied to clear glass) that allows only the blue light through the filter — this is why the bulbs appear blue. Because very little blue light is produced by a halogen bulb in the first place, it is only this very small amount — a tiny fraction of the total amount of light produced by a halogen bulb filament — that ever reaches the road.
My emphasis.

From the acceptable blue globes section:

There's no good evidence that the type of light produced by this sort of bulb actually allows drivers to see better than the type of light produced by a regular, clear bulb. And there've been no studies on the effect of this type of light upon seeing and glare in bad weather, for instance. It has, on the other hand, been shown that these bulbs cause more glare than clear bulbs. Can you see better with this sort of bulb? No, probably not. Some people vigourously defend blue-glass bulbs, insisting they can see better. But that's another problem: they think they can see better than they actually can. There've been no studies to determine exactly how dangerous it is to think you can see better than you really can, but it probably doesn't help safety.