Light can have different colours or spectral composition. This is expressed as colour temperature in Kelvin. An incandescent lamp has warm white light with a lot of red at 2400K. Daylight white has almost evenly the whole spectrum from blue to red with 6500K. Then there is illuminance, which is the amount of light cast onto a surface. This is given in lux. This luminaire has 10000 lux at a distance of 15 cm.