Day Two began by connecting up a solar panel and putting it under halogen lights and I was asked to measure the effects on the solar panel in current and lux. What is lux you may ask (no its not soap..in this case) ?
Lux is a standardised unit of measurement of the light intensity (which can also be called “illuminance” or “illumination”) – as an example for reference purposes – 1 lux is equal to the illumination of a surface one metre away from a single candle. Some further examples of settings with the average recommended illuminance is measured in lux are: Outdoor average sunlight ranges from 32 000 to 100 000 lux, Warehouse aisles lights are lit to approx. 100-200 lux, a bright office requires about 400 lux of illumination, sunset and sunrise (with a clear sky), ambient outdoor light is also about 400 lux, Building corridors can be lit adequately at around 100 lux, Moonlight represents about 1 lux. The difference between the units lumen (often mentioned) and lux is that the lux takes into account the area over which the luminous flux is spread.
I measured both with meters and I got the following readings:
|Direct Sunlight||93 million miles||2.4||94,000|
|Daylight||93 million miles||0.1||2,000|
|4 Halogen lights||17.5cm||21.5||76,500|
|4 Halogen lights||24cm||1.8||67,500|
|4 Halogen lights||33cm||1.67||50,400|
|4 Halogen lights||39cm||1.00||34,000|
|4 Halogen lights||41cm||0.29||29,500|
|4 Halogen lights||46cm||0.85||25,000|
|4 Halogen lights||49cm||0.72||