By Turtle Times
Ok, this one gets talked to death, but we still don’t have a consensus. So let’s discuss it here under its heading. Here is some factual information about the light spectrum.
Light is generally considered an electromagnetic wave.
Wavelength is measured in Nanometers (1/1000000000 meter)
IR is 700nm – 1500nm
Visible light is 400nm – 700nm
UVA is 320nm – 400nm
UVB is 286nm – 320nm
UVC is 200nm – 286nm
VUV is 100nm – 200nm (vacuum UV)
Window glass through at least 50 websites I reviewed tonight, ranging from hobbyist, manufacturers to collegiate physics presentations on the web all agree that there isn’t a significant amount of UVB light passed through. The problem with this statement is that the majority of sights just take this as common knowledge and move on. A few sites refer to the state of the energy. I will give a quick explanation
Light hits a “transparent” object, and if the energy level of the light matches it doesn’t pass through. Glass lets through the light that is above 350nm in general. This is to say that a lot of the light is absorbed or reflected, but what I can’t find is how much is absorbed and reflected.
At this point, it requires a major study of the chemical makeup of glass and the intensity of the light and a bunch of heavy math that I am not capable of doing at this time.
What I have discovered through Melissa Kaplan’s fine site Anapsid.org is a couple of charts that give us a breakdown of natural sunlight and things it passes through
A single pane window should transmit about 5% UVB, modern double pained windows will allow about half that, if they’re tinted even less. If the light goes through a screen or a tank wall cut even more. So with a single pane window with access to direct sunlight for part of the day, you get the same output as a Reptisun 5.0 bulb at 12 inches away.
Now onto some theories…
Barb Reader has had Timmy the Cooter for nearly 43 years. He started as a dimestore turtle. For the majority of Timmy’s life, he has had just a window light. From Barb’s story, it took Timmy several years to reach adult size.
I have had Uzumaki the Cooter for 8 months. He has had a Reptisun 5.0 bulb on for 14 hours a day, and he usually sits about 5 inches away. My turtle started at 1.75 inches and is now 4.5 inches. At his current rate of growth, he will be a full-grown adult this time next year.
My theory is that turtles grow a lot faster when subjected to longer and more regular UVB exposure. The amount of UVB given off by the light and the assumption that the window was single paned is close, just the actual amount of time the turtle is exposed differs.
So is this form of accelerated growth good? normal?
Does anybody have a turtle before these new crops of lights came out …read more
Read more here: Turtle Times
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