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Old 10-19-2009, 01:36 PM   #1 (permalink)
 
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A Little knowledge needed please

Hi, at present we use 2 types of lamps in our vtu's, Titan Tri-tan 250w giving VUA of 29 with 2.4% UVB and Epcot leisure Plasma Trio giving VUA? WITH 3% UVB. again at 250w( all the lamps are made by cosmedico). Now another company(Sunquest) claim that their 200w lamps have 53UVA with 1.6%UVB.
Now my question is,or questions in this case. Do people think that Sunquest's figures for their Lamps are full of ****. Is there an Industry standard for lamps?? The vtu's are Tansun Symphany's by the way. Thanks
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Old 10-19-2009, 02:23 PM   #2 (permalink)
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Re: A Little knowledge needed please

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Originally Posted by Dee2711 View Post
Hi, at present we use 2 types of lamps in our vtu's, Titan Tri-tan 250w giving VUA of 29 with 2.4% UVB and Epcot leisure Plasma Trio giving VUA? WITH 3% UVB. again at 250w( all the lamps are made by cosmedico). Now another company(Sunquest) claim that their 200w lamps have 53UVA with 1.6%UVB.
Now my question is,or questions in this case. Do people think that Sunquest's figures for their Lamps are full of ****. Is there an Industry standard for lamps?? The vtu's are Tansun Symphany's by the way. Thanks
Assuming that the numbers you are giving are total UV output in mW/cm² A+B then:

Powered @ 250w 29 with 2.4% UVB would be .696 mW/cm² UVB
Powered @ 200w 53 with 1.6% UVB would be .898 mW/cm² UVB

The second one would have more UVB and be stronger even though the percent be is lower (percent B rating is bull$h!t, it is for marketing. mW/cm² is what is important).

Wattage does not make much difference here. Both wattages provide enough power to generate the projection of plenty of UVA. The second lamp has twice the browning power since the UVA is higher and the UVB is only a little stronger but both are not frying lamps . They are similar in the UVB range.

The other lamp you gave without a UVA rating cannot be determined at all.

Never go by percent UVB, it is misleading.

See, the real way to measure output is in mW/cm².

Now, let's say that I have a l.amp that puts out 25 mW/cm² A+B (total UV) and has an output of 1 mW/cm² B (UVB only) then the percent UVB is 1/25 = .04 x 100 = 4% UVB.

Now we have another l.amp that has an output of 50 mW/cm² A+B (total UV) and has an output of 1 mW/cm² B (UVB only) then the percent B is 1/50 = .02 x 100 = 2% UVB.

Which l.amp is stronger? Is it the 2% or the 4%?

Well it is the 2% UVB because we have all of the facts and not just the marketing hype. The UVB output between both l.amps is EXACTLY THE SAME!!! Which is 1 mW/cm² B. The second l.amp however has twice the UVA which will tan much better. You will get much more browning power out of lamp 2 even though it calculates out to less "percent" UVB.

Are you starting to see why this percent value is bull$h!t and misleading?

Last edited by Brian Oshman; 10-19-2009 at 02:30 PM.
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Old 10-19-2009, 02:31 PM   #3 (permalink)
 
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Re: A Little knowledge needed please

Is 53 UVA look to high, just that after doing a little research, most lamp are in the 20's to 30's range? Thanks for your input by the way
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Old 10-19-2009, 02:50 PM   #4 (permalink)
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Re: A Little knowledge needed please

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Is 53 UVA look to high, just that after doing a little research, most lamp are in the 20's to 30's range? Thanks for your input by the way
53 is average for lamps like that. 20 to 30 is low for 200-250 watt lamps.
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Old 10-19-2009, 04:08 PM   #5 (permalink)
 
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Re: A Little knowledge needed please

Also, sorry to a pain in the ***, but have been told in the past that most of the UVB can not penetrate glass? Does this also apply to the acrylics aswell. Not that it applies to these vtu's, we have grids on these, but just wondering about the beds when it comes to re-tubing them.
Thanks for the info on the lamps, understand that now
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Old 10-19-2009, 04:10 PM   #6 (permalink)
 
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Re: A Little knowledge needed please

I also apologise if this is the millionth time you've had to explain this to us thicko's
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Old 10-19-2009, 06:02 PM   #7 (permalink)
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Re: A Little knowledge needed please

Acrylics are designed not to block UV rays. As they get older though they do become less transparent particularly the ones made in the US.

Filter Glass is designed to block UV rays. Two completely different things.
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Old 10-19-2009, 06:37 PM   #8 (permalink)
 
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Re: A Little knowledge needed please

Hello Ireland,

Quote:
Assuming that the numbers you are giving are total UV output in mW/cm² A+B then
Although everything Brian said in post # 2 above is correct... unfortunately the Cosmedico values on their website are in "Watts Flux" not mW/cm². Without going into a big explanation of flux from an integrating sphere vs mW/cm² from a UV meter... suffice it to say that the flux values are lower than the irradiance mW values.

I commend Cosmedico for at least showing their "outputs" where most lamp providers do not... but I wish they would convert to mW/cm² for an array at body position. Flux from a single lamp in a sphere means for say 100W input you get say 29W UV out.

You need to beg, borrow, or steal some UV meters for total UV and UVB... or buy them at www.solarmeter.com models 5.0 and 6.0. Then you can see for yourself what outputs any lamps have.

Regarding "glass" - the filter glass that is part of High Pressure facials or body lamps is special. It transmits most UVA and it absorbs some UVB to keep ratio "correct" for tanning while limiting burning. UVT acrylic over Low Pressure tubes transmits almost all UV when new... and starts blocking UVB when old (solarized).
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Old 10-19-2009, 07:08 PM   #9 (permalink)
 
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Talking Re: A Little knowledge needed please

Thanks for the info guy's, just as a matter of interest, do you know roughly how old the acrylic normally is when it starts blocking, doesn't really affect me, but one of my competitors has oldish beds lol
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