0
lux on the page
0
300
500
1,600
Lamp brightness:
Distance from lamp to page:
Type of lamp
Bare bulb or open shade (light goes everywhere)
Table lamp with a shade, pointing down
Reading arm or directed head (wide beam)
Small cordless lamp: 150 lm
Typical bulb: 400 lm
Bright bulb: 800 lm
A rough model: lux is about lumens times a beam factor, divided by the distance squared. Real lamps vary, so treat the number as a guide, not a measurement.