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SUN MASTERS · 16th November 2005, 07:09 PM

If you requested this information previously, I must apologize for entering into the "early senility" period of my life-LOL.

Here is the information you requested for the HPO:

UVB% [280 nm - 320 nm] (1530w) = 1.6% / (620w) = 2.6% (see comments below)

UVA2% [320 nm - 340 nm] (1530w) = 5.6% / (620w) = 6.0%

UVA1% [340 nm - 400 nm] (1530w) = 92.8% / (620w) = 91.4%

UVA% [320 nm - 400 nm] (1530w) = 98.4% / (620w) = 97.4%

Keep in mind that UVB percentage can be misleading because the % is a function of the amount of UVA irradiance available and that (as you would expect) the 1530w lamp has more TI (Total Irradiance) than the 620w lamp. For instance, the "absolute" amount of UVB irradiance in the 1530w lamp is 6164 mW/m^2 and the 620w is 5214 mW/m^2. Thus, the difference in the "absolute" amount of UVB between the two is much less (i.e., the 1530w has only 18% more than the 620w) than is the percentage difference (where there is a 63% difference).

What is important is that both lamps have more than enough UVB energy to stimulate the production of vitamin D within the session time of the HPO.

Let me know if you need more information.

Regards.

Don

16th November 2005, 07:09 PM	#1 (permalink)
SUN MASTERS Rookie Join Date: Sep 2005 Posts: 3	Sportarredo HPO Stand Up If you requested this information previously, I must apologize for entering into the "early senility" period of my life-LOL. Here is the information you requested for the HPO: UVB% [280 nm - 320 nm] (1530w) = 1.6% / (620w) = 2.6% (see comments below) UVA2% [320 nm - 340 nm] (1530w) = 5.6% / (620w) = 6.0% UVA1% [340 nm - 400 nm] (1530w) = 92.8% / (620w) = 91.4% UVA% [320 nm - 400 nm] (1530w) = 98.4% / (620w) = 97.4% Keep in mind that UVB percentage can be misleading because the % is a function of the amount of UVA irradiance available and that (as you would expect) the 1530w lamp has more TI (Total Irradiance) than the 620w lamp. For instance, the "absolute" amount of UVB irradiance in the 1530w lamp is 6164 mW/m^2 and the 620w is 5214 mW/m^2. Thus, the difference in the "absolute" amount of UVB between the two is much less (i.e., the 1530w has only 18% more than the 620w) than is the percentage difference (where there is a 63% difference). What is important is that both lamps have more than enough UVB energy to stimulate the production of vitamin D within the session time of the HPO. Let me know if you need more information. Regards. Don