Acrylic transmitting UV - TanToday

SUNNYDAYS · 25th February 2009, 02:24 PM

I took some readings today in my 34 lamp Pro Suck 160/100 and got the following readings would you think I need to replace the acrylic?

With Acrylic:
5.0 39.4
6.0 1.39 3.53%
7.0 17.6 13.9 to 4 meds

Without Acrylic

5.0 40
6.0 1.46 3.6%
7.0 19.0 12.6 to 4 meds

Bed is a 12 min max and lamps have about 350 hours on them.

What do you think?

John · 25th February 2009, 02:59 PM

No not much difference there. The UVB is what mainly gets blocked by a solarized acrylic. With fresh lamps it is most likely coming in around 10-11 minutes. I would say if it was blocking more like 20% then get them changed.

rustytrombone · 25th February 2009, 03:42 PM

yeah that's nothing.

SUNNYDAYS · 25th February 2009, 04:54 PM

Thanks John these are the hereaus 20/160's that I got from you, they make my Pro Suck bed tan half way decent.

solarmeter® · 25th February 2009, 07:02 PM

I agree. Even brand spanking new acrylic absorbs 5-10% of UVB and MED/hr. Your readings are fine... small loss.

Note to newbies: See that 5.0 readings are basically the same with / without acrylic. This is because almost ALL UVA transmits thru both new and old acrylic (unless it is so bad to be yellow and cracked!). But 6.0 or 7.0 readings DO drop off as acrylic gets old.

25th February 2009, 02:24 PM	#1 (permalink)
SUNNYDAYS Hall of Famer Join Date: Nov 2004 Posts: 1,794	Acrylic transmitting UV I took some readings today in my 34 lamp Pro Suck 160/100 and got the following readings would you think I need to replace the acrylic? With Acrylic: 5.0 39.4 6.0 1.39 3.53% 7.0 17.6 13.9 to 4 meds Without Acrylic 5.0 40 6.0 1.46 3.6% 7.0 19.0 12.6 to 4 meds Bed is a 12 min max and lamps have about 350 hours on them. What do you think?

25th February 2009, 02:59 PM	#2 (permalink)
John Hall of Famer Join Date: Nov 2004 Posts: 2,919	Re: Acrylic transmitting UV No not much difference there. The UVB is what mainly gets blocked by a solarized acrylic. With fresh lamps it is most likely coming in around 10-11 minutes. I would say if it was blocking more like 20% then get them changed. __________________ John Hayes Ultraviolet Resources International

25th February 2009, 03:42 PM	#3 (permalink)
rustytrombone All Star Join Date: Mar 2006 Posts: 91	Re: Acrylic transmitting UV yeah that's nothing.

25th February 2009, 04:54 PM	#4 (permalink)
SUNNYDAYS Hall of Famer Join Date: Nov 2004 Posts: 1,794	Re: Acrylic transmitting UV Thanks John these are the hereaus 20/160's that I got from you, they make my Pro Suck bed tan half way decent.

25th February 2009, 07:02 PM	#5 (permalink)
solarmeter® UV Geek Squad Join Date: Nov 2004 Posts: 4,059	Re: Acrylic transmitting UV I agree. Even brand spanking new acrylic absorbs 5-10% of UVB and MED/hr. Your readings are fine... small loss. Note to newbies: See that 5.0 readings are basically the same with / without acrylic. This is because almost ALL UVA transmits thru both new and old acrylic (unless it is so bad to be yellow and cracked!). But 6.0 or 7.0 readings DO drop off as acrylic gets old. __________________ ......................Flashback 2001........................ "One of the 'ORIGINAL' TanToday Gang"

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