how do you measure light?

Answer 1

This depends on what about light you want to measure. You can measure light as an exposure value for the purpose of properly exposing a photograph with a camera using a light meter, which will indicate an f/stop and shutter speed. Or, you can measure the temperature of light using the Kelvin scale. You can measure the luminosity of the colors of light, which is a basic measure of that colors intensity or brightness in any number of ways. An analog method of measurement consists simply of either a radiometer or photometer which in their simplest forms are light sensitive silicon components known as photodiodes which produce forward biased current when exposed to light which when put in combination with numerous photodiodes produce an analog value which is then digitized and interpreted by a processor. This is quite the broad question don't you think? It's like asking how the sun illuminates the sky and the earth, or the difference between shade and sunlit. Light itself is broad, there is the speed of light, refraction of light, optics, the source of light, particle theory, wave theory, electromagnetic theory, the special theory of relativity, and quantum theory, to name a few. So, given the lack of specificity, what about light do you want to know or be measured?

Answer 2

There are several ways. Foot candles. The Kelvin Scale. The Incident Light Meter. The Reflected Light Meter.

Answer 3

Light is measured in F stops. It's confusing but, the lowest number lets in the most about of light. So, if you are in a very dark room, you would want to set it on the lowest which is (on most cameras) F2.8. If you are outside on a very sunny day you would want to use F24 or F32. I hope I could help. E-mail me for any more questions!

Answer 4

with a light ruler