Table 3.

Characteristics of Light

Light Level (Illuminance) in lux (lx)	CCT in kelvin (K)
Very low intensity <50	Warm (white) light 2700−3200
Low intensity 50-200	Neutral (white) light 3200−4200
Moderate intensity 200−400	Cool (white) light 4200−6200
Standard intensity 400−600	Very cool (blue) light 6200−9500
High intensity 600−1000	Extremely cool (blue) light >9500
Very high intensity >1000

Notes: These light levels can be measured horizontally or vertically.

Abbreviation: CCT, correlated color temperature.