I have seen a lot of people on the net say compact UVB bulbs are harmful to reptiles. Compact bulbs meaning they are shaped like a regular tube bent in half, corkscrew or in the shape of a halo/circle. These are being made by several different reptile product manufactures. The lights are said to cause blindness in your animals. Well, I've done some research on the net and found a website that actually did studies on these bulbs and had reported cases of effected reptiles along with some pretty sad pictures. This is the site, I encourage you to check it out! http://www.uvguide.co.uk/phototherapyphosphor.htm
Basically the information in the sites I've found on the net( not just the one I created the link to) states that these bulbs put out harmful amounts of UV radiation which can harm your reptile in more than one way. First off it states that because they are too bright and put out low wave length UVB and UVC your reptile gets photo-kerato-conjunctivitis ( basically the same thing as snow blindness in humans). It states that the eyes swell up and eventually swell shut. Accompanying this your reptiles exhibit lethargy, decreased appetite, sometimes even lesions that look like burns and exfoliation of the skin on the eyelids. Luckily they state that this is not permanent and if the bulbs are removed your reptile should be fully recovered in 2-14 days. Also (my theory from past experience) If exposed for a long period of time your reptile is unable to control how much D3 it makes and the calcium levels increase making it susceptible to getting Hypercalcemia, especially if you are giving it a D3 supplement. (I am currently working to prove this with the help of my vet) Look at the previous post to learn about Hypercalcemia.
Here are some pics of different compact bulbs
Exposure and Hazards of UVExposure to UV light posses a serious threat to both the eye and skin. Diagnosis of exposure may vary but are commonly set into two categories, photokeratitis (eye injury) and erythema (sunburn). Photokeratitis is an inflammation of the cornea (outer protective coating of the eye) that is caused by exposure to ultraviolet radiation. Eye injury can occur due to very brief exposure or with just a flash of intense UV. Erythema is sunburn of the skin and can occur within a few seconds of exposure to a concentrated form of UV. Prolonged exposure to ultraviolet light also causes premature aging and cancer of the skin. So what would a lizard look like if it had sunburn? It would look like it was shedding continuously, especially around the eyes. This is also described as being apart of "photo-kerato-conjunctivitis".
Here are two websites about reptile lighting that briefly mention "photo-kerato-conjuctivitis" http://www.beardeddragoncaresheet.org/lighting.html http://web.mac.com/breadnbutterdesign/%5BCND%5D/MegaRay_Lamp_Review.html