LIGHT LEVELS & LUMENS
Lumens represents the amount of light emitted by a light source, such as a light bulb. Following are typical lumens levels for various light (CFL) bulbs. Realize that recommended light levels will vary based on the person and the task. When purchasing light bulbs, however, don't assume that more watts means more light, more lumens means more light.
Lumens		Efficiacy (lumens/watt)
122	15 watt incandescent	8
125	3 watt CFL	41
185	15 watt krypton	12
210	25 watt incandescent	8
	ambient lighting
400	9 watt CFL	44
460	40 watt incandescent	12
500	10 watt CFL	50
	general room lighting
890	60 watt incandescent	15
900	15 CFL	60
1,180	75 watt incandescent	16
1,200	20 watt CFL	60
1,380	23 watt CFL	60
	suitable for reading
1,750	100 watt incandescent	17
1,750	29 watt CFL	60
2,780	39 watt CFL	71
2,780	150 watt incandescent	19
Light on a surface (such as a tabletop) is referred to as illuminance, which is typically represented by footcandles (lumens per square foot, equal to 10.76 lux) or lux (lumens per square meter, equal to 0.092903 footcandles).