TanToday - Helping Salon Owners, One At A Time, Since 2000! - View Single Post

solarmeter® · 19th April 2006, 10:47 AM

Wow - that IS interesting. The "gap" in this case has narrowed indeed. Father tan would be worried!

Regarding the tanning power.... I would have to assume the HP lamps are not 1000W - 1400W because they would read lot's higher on a 5.0 meter than any 160W new era tube would. What wattage are they?

The best VH* new era 5.0 readings I've seen are ~75 mW/cm² at body position with good canopy illumination geometry. Most HP readings are above 100... with BIG wattage systems nearing 200.

It would be cool if Don could run a spectrogram on the two units and overlay the graphs. The "shifting" of the UVB photons must be somewhat similar for both the 6.0 AND 7.0 meters to read the same. HID/HP output is more "spikey" than LP... but the meters tend to smooth out the spikes and resolve the irradiance into a total single number.

I would think in this particular instance the two units will tan about the same. I looked at a log plot of the 5.0 meter sensor response; it IS picking up out to 420nm 3 decades down and goes totally blind at ~435nm 4 decades down.... (fyi for Don - I can fax you the log plot if you want).

19th April 2006, 10:47 AM	#4 (permalink)
solarmeter® UV Geek Squad Join Date: Nov 2004 Location: Lake St Clair Posts: 3,371	Re: Meeting of the minds Wow - that IS interesting. The "gap" in this case has narrowed indeed. Father tan would be worried! Regarding the tanning power.... I would have to assume the HP lamps are not 1000W - 1400W because they would read lot's higher on a 5.0 meter than any 160W new era tube would. What wattage are they? The best VH* new era 5.0 readings I've seen are ~75 mW/cm² at body position with good canopy illumination geometry. Most HP readings are above 100... with BIG wattage systems nearing 200. It would be cool if Don could run a spectrogram on the two units and overlay the graphs. The "shifting" of the UVB photons must be somewhat similar for both the 6.0 AND 7.0 meters to read the same. HID/HP output is more "spikey" than LP... but the meters tend to smooth out the spikes and resolve the irradiance into a total single number. I would think in this particular instance the two units will tan about the same. I looked at a log plot of the 5.0 meter sensor response; it IS picking up out to 420nm 3 decades down and goes totally blind at ~435nm 4 decades down.... (fyi for Don - I can fax you the log plot if you want).