Many people believe that the higher the color temperature the brighter the lamp. This is incorrect. The color temperature is purely a scale to measure the color of the light output. It is a reference purely for color and could equally be called White, Green or Blue. The reality is the higher up the scale the lamps are the less bright they become. 5200K lamps are approx 5% brighter (measured in Lumens, not degrees K) than 7000K. But even a 9000K kit, which is another 10% dimmer, has so much more light than your used to with halogens it doesn’t matter much. HID lights provide tons of light you will not notice a tad less.

Degrees K = ONLY COLOR

Lumen = BRIGHT