How to measure light in the studio?

There are two ways to measure light in the studio: 1 is an empirical estimate, and 2/is that the exposure meter camera cannot be used for measuring light.

Specifically:

First of all, the sensitivity is generally 100, and the shutter is unified as one fifth of 125.

1 empirical estimation method, which is common, but simple and inaccurate. Just adjust it roughly, and then don't believe that you can practice accurately with your eyes, because even if two lights with the same power are turned on to the same value, the difference is great!

If the exposure meter is used, it must be incident-reflection dual mode. The incident measurement and correction of the output of the lamp, the proportion of reflected light and the aperture value you need.