2, lamps commonly used optical units
1) The luminous flux of a 40W ordinary incandescent lamp is 350-470lm.
The luminous flux of a 40W ordinary straight tubular fluorescent lamp is
About 2800lm, 6-8 times that of incandescent lamps.
2) The intensity of sunlight at noon during the summer is about 5000 lx, winter
The ground illumination is about 2000 lx on sunny days, and the clear moonlight floor
Illumination is about 0.2 lx.
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