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Don · 20th April 2006, 05:17 PM

You can have two irradiance sources with exactly the same total W/cm^2 reading and each of them could have completely different Tt (tanning power) readings.

You have to know how many photons you have in each wavelength in order to compare one irradiance source with another irradiance source.

It is not only "how many" photons there are (which is what Steve's meter reads) but also "where they are positioned" (which is what my spectroradiometer reads) that is important.

What you can do to "estimate" the tanning power is subtract the Model 6.0 (UVB + UVA2) from the Model 5.0 (Total Irradiance) reading and this will give you a pretty good handle on the "tanning power" of your sunbed.

And, if you also have a Model 7.0 (MED/hour) meter, you can also "estimate" the erythemal (sunburning) power of your sunbed.

Remember, it's not what you have, it's how you use it-LOL.

20th April 2006, 05:17 PM	#12 (permalink)
Don Veteran Join Date: Nov 2004 Location: USA Posts: 376	Re: Meeting of the minds You can have two irradiance sources with exactly the same total W/cm^2 reading and each of them could have completely different Tt (tanning power) readings. You have to know how many photons you have in each wavelength in order to compare one irradiance source with another irradiance source. It is not only "how many" photons there are (which is what Steve's meter reads) but also "where they are positioned" (which is what my spectroradiometer reads) that is important. What you can do to "estimate" the tanning power is subtract the Model 6.0 (UVB + UVA2) from the Model 5.0 (Total Irradiance) reading and this will give you a pretty good handle on the "tanning power" of your sunbed. And, if you also have a Model 7.0 (MED/hour) meter, you can also "estimate" the erythemal (sunburning) power of your sunbed. Remember, it's not what you have, it's how you use it-LOL.