Light output meter in watts


Diameter inside 3.762? surface area is pi*d^2 = 3.1416*3.762*3.762 = 44.46 sq inches

Size of small silicon chip (give away) .68? x .750? give about 689 lux under desk lamp .51 sq inches.  Power factor = 44.46/.51 = 87.2

Preliminary measurements
.5 amp tungsten at about 2.8 v gives 1.65 ma for silicon cell. 87.2 * 1.65 = .144 amp of  light. .144/.5 = .288 or about 29% converted to light

30.3 ma LED at about 3.6 volts gives .108 ma.  87.2* .000108 = .0094 amp of light
.0094/.0303 = .31 or 31% for LEDs

Size of larger silicon chip (kept) .71?x.750? gives about 711 LUX under desk lamp or .5325 sq inches.  Power factor = 44.46/.5325 = 83.5

Don?t know voltage of sensor, thus power out put ratio not know at this time.