Before they sprout, the only thing light will add is maybe some warmth. But, once they do sprout, you'll want the light ASAP.

Heat is the most important thing before they sprout, especially for the types of peppers you are starting, you want a soil temp of around 80f during the daytime hours. This will help with germination and increase your chance of success. The easiest way to do this is with a heat mat.

if you do a search Im sure you can find more detailed instructions on seed starting for hot peppers.
I hope this helps.

-WickedMojo

I do not use a heat mat. In fact, the one year I did, I had the most erratic and poor results of any year. I am sure I was using a poor heating mat, but I have had great results just using the flourescent lights. I use normal flats and put the plastic dome over them until they sprout. I have these trays less than 1 inch under flourescent lights. Even though my basement is about 65 degrees, the trays are 75-80 degrees due to the lights.

I also do not use a heat mat and my seeds all did great. I had the light on them 16 hours a day from the day i planted them. Seeds also like a few hours of complete darkness to rest up for the next day of growing. Florecent lights do not give off enough heat to make a difference but if your seeds are in a warm room they should do just fine.
Just remember that when transplanted outside, they need heat to grow big and mature. Plastic is a great way to ensure soil heat and keeps it longer. I know people are against it because of environmental issues but it really works well.
Your seeds will be fine!

Here is a link that might be useful: Home Gardening