He he, to clear the mud up even more...UVB bulbs come in basically 3 varieties: flourescent, compact flourescent, and mercury vapor bulbs. That list is in order of price from low to high, but you also get what you pay for.
The flourescent bulb is a long tube that requires a special flourescent bulb fixture. It provides some UVB/UVA but only at short distances so it needs to be placed within 12 inches or less of the basking area. It also needs to be replaced regularly like every 6 months. This type of bulb will not provide any heat, so like SpotsMama said, you will still need a regular household lightbulb for heat. Make sure to get a bulb that specifically states that it provides UVB (not all bulbs say they provide UVA but it's pretty much implied since UVA is between UVB and visible light in the light spectrum). The Reptisun or Reptiglo bulbs are popular and come in different strengths, like 5.0, 8.0, and 10.0. The 5.0 bulbs are adequate for temperate zoned species like RES. The higher bulbs are more for desert and equatorial animals.
Compact flourescent bulbs are available with the standard incandescent screw type base that you can use in a normal light bulb reflector. These provide UVB/UVA much the same as the flourescent bulbs do, except they are more efficient at it and can project the radiation a little bit further, like an additional 3 inches. So they should be placed within 15 inches of the basking area, but the closer the better. Like normal flourescent bulbs, these do not provide heat.
Mercury vapor bulbs also use the standard screw type base but since they also generate so much heat, you need to make sure the reflector has a ceramic base and is rated for the higher wattage. These bulbs are best used for much larger setups and adult turtles since they provide UVB/UVA at a much higher dosage and are effective at further distances. Never put a mercury vapor bulb closer than 12 inches from the animal's skin (or your own for that matter) as it can cause skin damage. These bulbs generate some really nice heat and are ideal for reptile basking lamps since you only need the one bulb for UVB/UVA and heat. They also only need to be replaced every 12 to 14 months. But they are expensive, like $45 online, $60+ in stores.
Another important point, UVB/UVA cannot pass through glass or plastic so make sure you don't position your bulbs over any kind of solid cover. They should shine directly on the animal. Screen mesh will also diminish the effectiveness so take that into consideration as well. If you use a screen top, get one of the higher rated bulbs if using one of the flourescent kind (like the 8.0 or 10.0 instead of the 5.0).
Hope this didn't make things too confusing for you!
