I metered the sun today - TanToday - Helping Salon Owners, One At A Time, Since 2000!

trackerbuddy · 15th July 2008, 08:53 PM

I metered the sun with my 7.0 at noon on a clear day in Southwest Ohio. It read 4.0. I meant to do it on June 21 the longest day of the year but I forgot. It would be interesting if someone metered it with a 5.0 and a 6.0 to find the ratio of UVA and UVB. I don't think it is a selling point just some FYI

solarmeter® · 19th July 2008, 09:44 AM

Here in MI none of the days near June 21 were pure clear deep blue sky with low humidity and cool temperature.... so the sun readings were similar to what you got.

But finally about a week ago such a day arrived: Crystal clear with about 10% puffy white clouds. The UV index reached 8.9. The highest I've ever seen up here ~42°N is about 9.1.

A UVI of 9.0 would read 5.0 FDA MED/hr on the 7.0 meter.

Model 5.0 would read ~5.8 and model 6.0 would read ~0.38 mW/cm².

So percent UVB would be 0.38/5.8 = 6.5%

When I was in Saipan (15°N) in late April the UVI reached 14.2 !!!!! That would be 7.9 FDA MED/hr. Sun was straight overhead at solar noon... NO shadow. I did not take 5.0 or 6.0 readings.

yamahaguy · 20th July 2008, 11:18 AM

Excuse my ignorance but what does this mean? In simple terms.

solarmeter® · 20th July 2008, 11:37 AM

That "global warming" is not increasing UV levels. Put Algore in the trash can.

trackerbuddy · 20th July 2008, 05:16 PM

This may belong in the geeks with meters forum but I misposted it to begin with. What does it mean. Well a 7.0 meter reads the dose of UV light we divide 240 by the meter reading to determine the length of time it takes to get a maximum safe FDA dose. 5.0 and 6.0 meters measure different parts of the UV spectrum. Divide the amount of UVB by the total amount of UV to get percentage of UVB.
Many of the lamps sold have a listed UVB component whether it is 1.6 3.3 5.0 6.5 7.0 8.5 or 10% UVB causes our skin to produce pigment. UVA causes the pigment to oxidize and turn brown. The percent of UVB is not the last word of how powerful a lamp is 1.6% of 200 is more than 5% of 50.
I metered the sun because I was bored and curious. According to Solar Steve the sun on Saipan is nearly twice that of what it is here

Drew · 31st July 2008, 10:40 PM

I will get 7 on a 5.0 in summer in San Diego

haven't done 7.0 in mid summer but I have got a 4.8 recently.

UV index hits 11 or here sometimes

15th July 2008, 08:53 PM	#1 (permalink)
trackerbuddy battered & bruised rookie Join Date: Jul 2007 Location: ohio Posts: 100	I metered the sun today I metered the sun with my 7.0 at noon on a clear day in Southwest Ohio. It read 4.0. I meant to do it on June 21 the longest day of the year but I forgot. It would be interesting if someone metered it with a 5.0 and a 6.0 to find the ratio of UVA and UVB. I don't think it is a selling point just some FYI

19th July 2008, 09:44 AM	#2 (permalink)
solarmeter® UV Geek Squad Join Date: Nov 2004 Location: Lake St Clair Posts: 3,194	Re: I metered the sun today Here in MI none of the days near June 21 were pure clear deep blue sky with low humidity and cool temperature.... so the sun readings were similar to what you got. But finally about a week ago such a day arrived: Crystal clear with about 10% puffy white clouds. The UV index reached 8.9. The highest I've ever seen up here ~42°N is about 9.1. A UVI of 9.0 would read 5.0 FDA MED/hr on the 7.0 meter. Model 5.0 would read ~5.8 and model 6.0 would read ~0.38 mW/cm². So percent UVB would be 0.38/5.8 = 6.5% When I was in Saipan (15°N) in late April the UVI reached 14.2 !!!!! That would be 7.9 FDA MED/hr. Sun was straight overhead at solar noon... NO shadow. I did not take 5.0 or 6.0 readings. __________________ ......................Flashback 2001........................ "One of the 'ORIGINAL' TanToday Gang"

20th July 2008, 11:18 AM	#3 (permalink)
yamahaguy All Star Join Date: Aug 2006 Location: Midwest Posts: 110	Re: I metered the sun today Excuse my ignorance but what does this mean? In simple terms.

20th July 2008, 11:37 AM	#4 (permalink)
solarmeter® UV Geek Squad Join Date: Nov 2004 Location: Lake St Clair Posts: 3,194	Re: I metered the sun today That "global warming" is not increasing UV levels. Put Algore in the trash can. __________________ ......................Flashback 2001........................ "One of the 'ORIGINAL' TanToday Gang"

20th July 2008, 05:16 PM	#5 (permalink)
trackerbuddy battered & bruised rookie Join Date: Jul 2007 Location: ohio Posts: 100	Re: I metered the sun today This may belong in the geeks with meters forum but I misposted it to begin with. What does it mean. Well a 7.0 meter reads the dose of UV light we divide 240 by the meter reading to determine the length of time it takes to get a maximum safe FDA dose. 5.0 and 6.0 meters measure different parts of the UV spectrum. Divide the amount of UVB by the total amount of UV to get percentage of UVB. Many of the lamps sold have a listed UVB component whether it is 1.6 3.3 5.0 6.5 7.0 8.5 or 10% UVB causes our skin to produce pigment. UVA causes the pigment to oxidize and turn brown. The percent of UVB is not the last word of how powerful a lamp is 1.6% of 200 is more than 5% of 50. I metered the sun because I was bored and curious. According to Solar Steve the sun on Saipan is nearly twice that of what it is here __________________ www.wrightimagesalon.com

31st July 2008, 10:40 PM	#6 (permalink)
Drew Hall of Famer Join Date: Nov 2004 Location: Ca Posts: 2,743	Re: I metered the sun today I will get 7 on a 5.0 in summer in San Diego haven't done 7.0 in mid summer but I have got a 4.8 recently. UV index hits 11 or here sometimes

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode