Here's a link to some information about the output of many of the bulbs currently available.



http://russiantortoise.org/uvb.htm



Here's a link to the main page of the other link. You could spend a couple of hours reading all of the information contained in all of the links on this page. There is some really excellent information, even about UV meters for measuring output.



http://reptileuv.com/



Keep in mind, this site sells these products. They seem to critique all of the products without bias, but they are ultimately trying to sell stuff.



Here's yet another link to information regarding D3 synthesis



http://happyturtle.ms11.net/LIGHTING.html



And lastly, probably the most comprehensive link addressing most of the questions that you asked. This Austin dude really did some research!



http://www.austinsturtlepage.com/Articles/guidetolighting.htm



I hope this helps. What types of turtles are you keeping, or researching the needs thereof?

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