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Old 17th January 2008, 08:23 PM   #4 (permalink)
solarmeter®
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Join Date: Nov 2004
Location: Lake St Clair
Posts: 3,325
Default Re: Finally bought a 5.0 meter...now, how to use it???

Just pick a distance where the meter doesn't blow past it's 199.9 limit. If you can hold it to the facial glass/acrylic then fine. Or put it at "nose" position down by the "pillow".

Whatever.... just do it the same way every time. And let the beds warm up about the same 3 minutes every time to be consistent.

HP lamps (facials or full HP body lamps) can be quite squirlly measuring up at the glass/acrylic.... because moving the meter just a little bit can give different readings. This is due to the "hot" lamp beam concentrated in the center, and to reflector geometry. It is generally better to measure farther away for a more uniform illumination geometry.
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