I just read a wonderful (and mind boggling) article by Bob MacCargar referencing 1) minimum and maximum ultraviolet B exposure levels by natural sunlight 2) What range is necessary for an iguana 3) which bulbs peform best in terms of meeting these specific requirements. Some quotes:
"The USDA recently did a study with an Ultraviolet Pyranometer and found readings of UV-B in Florida on June 1st that reached 450 microwatts per square inch" "Although iguanas may not be exposed to as much as 450 microwatts per square inch on a continuous basis, they will spend several hours a day exposed to relatively high numbers. My studies, as well as those of others, have found that, even in the shade, global UV-B readings reach 30–50 microwatts per square inch . These numbers give us an idea of the minimum and maximum ultraviolet B exposure levels in nature."
The recommended exposure is "30–50 microwatts per square inch from a distance of 12" for 8–12 hours per day.(comparable to natural exposures in the wild) "
The best florescent tubes tested (Reptisun 5.0) emitted 12–15 microwatts per square inch at 12” The author has done extensive testing. His article states "The ZooMed 5.0 fluorescent lamps are at the top of the ladder in terms of meeting these specific requirements (i.e., the best “usable” UV-B). Use at least two of these lamps to achieve the desired exposure levels."
I think we need to remove the cover that is above the bulbs and the salesman at CBD says they do NOT emit heat. But I did read somewhere that the ends of the fixture can heat up. We'll need to check that out.
Hi Mark Glad you joined us. Some reptile lights are potentially harmful to humans. Mercury vapor lights in particular--due to the increased intensity. Here's a link where you can read a bit more. www.anapsid.org/mercuryvapor2.html
Tanning bulbs emit both UVA and UVB. The UVB % is in the same range as the ones we use for our igs. (5%-7%) The fluorescent tubes used for our igs are basically the same as tanning bed bulbs, exept in size. Also, in a tanning bed there are about 300 tubes (yeah so I exaggerate ;D) rather than the one or two that we use for igs. Our human eyeballs are safe unless we bask under the light with our igs and stare at the "sun". ;D