You need two bulbs - one for UVB and one for heat. The bulb you have provides neither. Here's a short description of the two bulbs you need and there's more info on the link below:
Both bulbs should be positioned over the basking platform.
1. Heat bulb. The purpose of this bulb is to provide the heat over the basking area that will motivate your turtle to get up there and bask. It also aids in digestion. A regular household incandescent bulb is fine as long as it heats the basking platform to around 88 to 90 degrees. I think people often use a 75 watt bulb for this purpose.
2. UVB bulb. A turtle needs to be exposed to UVB light so his body can absorb the calcium he eats. Otherwise the calcium goes to waste. He has to have good amounts of calcium of course for his shell and bones. The UVB bulb will be a specialized fluorescent bulb that you get at a pet store or on-line pet supply place. Most people use compact fluorescents although if you have a fixture for it a tube fluorescent is also a good choice. Whatever bulb you get must say on the packaging that it provides at least 5% (or 5.0) UVB. The bulbs that say "full spectrum" or "basking bulb" are not the right type. Any bulb that provides UVB also provides UVA, so you'll have both covered. A good bulb is the Exo Terra Repti Glo 5.0 26 watt compact fluorescent.
Here's more explanation of the lighting requirements:
http://www.redearslider.com/index_lighting_basking.html