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2- Make sure you are at your subject's position, with the dome facing the light (some people prefer the camera. This can vary depending on which light and what you are measuring)
History on this: Transparency film is vulnerable to irreparable loss of detail in highlights from overexposure. Commercial professionals using transparency film normally metered the main light to be sure not to overexpose the highlights. Negative film is vulnerable to irreparable loss of detail in shadows from underexposure, so portrait photographers using negative film normally metered the fill light (that is, pointing the meter toward the camera) to be sure not to underexpose the shadows.
As photographers moved to digital, they maintained their accustomed method of metering, adjusted it to work with digital sensors, and taught others to do it their way. But with proper adjustments, either way works.
The reason a great many professionals continue to use light meters is to save time--particularly with complex lighting set-ups. A light meter reading can tell you much more about the light conditions in much less time than a bunch of trial and error exposures. Where professionals can get away without it is when they use fairly static setups.
HOWEVER, using the CyberCommander system with the CyberCommander as flashmeter, I'm certainly able to handle even the most complex lighting setup with much more speed and certainty than with any other meter. Without a doubt for my use, CyberCommander is the most advanced and effective remote control system available at any price today.