Danielsternlighting.com [/align]In fact, you get less usable light from such a bulb than from a regular clear bulb, and here's why: A blue filter removes nonblue components of the light passing through it. Halogen bulbs produce very little light in the blue frequency range. When you put a blue filter on the bulb or lamp, you are reducing the amount of usable light that gets from the glowing filament to the reflector, to the lens and from there to the road. Prove it to yourself using nothing more than the windshield in your car...drive towards a yellow-orange Sodium vapor street light and watch the light as it shines first through the clear portion of the windshield, then through the blue strip at the top. Up there through the blue, it certainly looks "whiter"...but it's also dimmer. If a bulb's sales material focuses on the color of the light rather than the amount of light, you should ask critical questions about the amount of light the bulb produces before choosing to use it.