Lumen Total light output per second. The measurement tends to be used for bulbs. Lux The intensity of light, measured as 1 lumen over 1 square metre. This measurement tends to be used by lamp designers.
Colour The temperature at which a black body, when heated, emits a certain colour, measured in Kelvin (K). At the lower end is red, with blue at the upper scale. Expected colour temperatures are: Standard H7 (Halogen) 2500K
Ring Xenon5000 Styling Upgrade H7 5000K
HID Xenon from 4200-5500K (upgraded HID burners are towards the upper end of this scale)
LED DRL 6000K Ring Xenon 150 Upgrade H7 3700K Natural daylight 6200K