Don Smith

Q-1: Which is the best 15 minute MET (Maximum Exposure Time) sunbed:

A. One with a Te (4.0 MED) time of 13.5 minutes (i.e., the lowest "legal" time) and a Tt (tanning time), i.e., the time it takes to delive a dose of tanning photons that will satisfy the most demanding client, of 13.5 minutes.?

Or:

B. One with a Te (4.0 MED) time of 24 minutes and a Tt time of 5.5 minutes?

Q-2: Why does the Model 7.0 (MED/hour) meter "calibrated" at 200 J/m^2/MED give "erroneous" readings?

C. Why does a HID/hp system (and sunlight) have more "tanning power" than even the best new-era LP sunlamp?

Note: Although it was addressed to Matt, feel free to "chime in" here (if you dare).

Neon Beach

Yes.

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Don Smith

45,001 useless posts.

Neon Beach

and then some!!!

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JOHN @ URI

Q1= B

I thought the 7.0 meters where at 210???

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engfant

Q.1: B. Not interested in burning, interested in tanning in the shortest possible time.

Q.2: It's reading a time to burn and not a true TAN TIME reading.

Q.C: Cause a 5.0meter reading of 100 at 2%UVB is WAY more than a 5.0 reading of 50 at 2%UVB even though they are both "2%".

I'd rather have 2% of a million $$$ than 2% of $2. But that's just me.

Don Smith

Some are calibrated at 210 J/m^2, i.e., the 1.0 MED definition used by NEW/EPA in the development of the Ultraviolet Index 9UVI); others use 200 J/m^2, i.e., the definition used by the CIE EAS; and still others use 156 J/m^2 which (as you know) is the definition used by the FDA EAS.

However, you must also keep in mind the fact that Solartech uses the CIE EAS which "weights" the wavelengths between 250 nm and 298 nm at 1.0 while the FDA EAS weights the wavelengths between 250 nm and 302 nm. Thus, photons falling between 299 nm and 302 nm are "devalued" by the MED/lhour meter and this causes innacurate readings for (a) HID/hp and (b) new era sunlamps.

That's why I have "specifically calibrated" my MED/hour meters for the "source" (i.e., sunlight, traditional LP, new era LP and HID/hp) I am reading so that they better "match" the reading I get with a spectroradiometer.

cametotalktan

Dang! is this something I should know?

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When I grown up I want to be Angerfant.....

Marca

please tell me no...

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eileen

The more you know the better. :)