I gotta disagree with the compact bulbs... I've seen a lot of mixed reviews, mixed emotions for those... I saw a video of the Bio Dude trying different fixtures and bulbs.... Some fixtures actually did produce considerably amount of UVB using a coil Bulb.... Effective range was about 6-8 inches... Different fixtures affected the amount of UVB it produced, and some fixtures had a better range than others. Even they were surprised ...'
I remember seeing a post about someone that tried it and it read like high amounts of UVB at 6 inches i believe..
Has anyone with a solormeter tried different fixtures? I am in no way saying to go buy a coil bulb, but since I saw that video I would like to try it myself.
Thats the problem with Coil bulbs.
They out out insanely high levels of UV right under them beside them and then nothing anywhere else.
So you will have a small UV section, that is intense and then the rest of the cage will have nothing. Kind of like MVBs do, but not really as MVBs tied the UV to heat so the animal basks less in it.
The bigger issue was the high concentration of UVA in few batches, that had some serious eye issues, with irreparable damage to alot of animals.
Now your thinking, well if spot UV is an issue why do Powersuns even exist. The answer to that is they recreate the sun, better than any other light source.
Your not trying to give your animal a UVI of 3 with a powersun, thats not the intention. Chameleons dont get 3UVI in the wild either.
They bask, in high UV, high IR light for an hour or 2. Then retreat to dappled light with no UVI or very low. So while they bask in 10 UVI, they only do it for an hour or 2.
Our logic with T5s, is provide uniform mid-level UV for 12 hours, whereas the powersun method is to provide high UV while basking and then dappled like it would in sunlight through your cage furnishings.
UV is just like DLI for plants. You can provide 3 UVI for 12 hours, but the same D3 creation can be had by using 9 for 4 hours. Or at least thats how I understand it.
However like Beman said, they get very hot so managing a basking spot with them in the common sized cages can be a challenge.
More so, they are not commonly used as they cost a fortune, that is the real reason for their lack of popularity.
They are very delicate, burnout fairly easily, need replaced every 6 months or so. An arcadia T5, is 20 and needs replaced 1 time a year. The powersun is 65 and needs replaced 2-3 or more times a year.