That's not a grow light. Get a proper CFL right away. ANY spectrum is better than an incandescent... 'daylight' if you can find it. Incandescents throw a lot of HEAT along with the light.
And if you aren't exchanging the air in there with a proper exhaust, not only will you have temp issues, but the plants may suffocate. You will see that as a darkening and crisping of the leaves.