Let me just start off by saying that I am a complete novice at growing anything. I recently began growing Bhut Jolokia from seeds that I purchased online at "Green Earth, Inc." These plants have been growing for about a month now. On some of the plants, the leaves are turning a dark purple color. From the Bhuts that I saw online, I haven't noticed any with purple coloration on the leaves. I'm growing these inside my house under a "cool white" fluorescent shop light. I'm growing these in a mix of miracle grow gardening soil, mushroom compost, and some perlite (I read that these peppers need good drainage). Could too much light cause this coloration? Or is it just normal? Any help is appreciated. I've attached a picture to show one of the plants with purple coloration.

Here is a link that might be useful: Bhut Jolokia - Purple Leaves