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Just started some sweet pepper seeds on heat pad on thick cutting board. when the plants come up (??????) I plane on putting them in a window facing the south, lots of sun when it is out. However, we have windows with UV protection in them, is this going to hurt my new seedlings, or should I just put under grow lights

I'm not sure about the UV protection, I suspect it cuts down on the light the plant gets. But with or without it, your peppers will do better under lights. Even if you have a full sun, south facing window, all the light is coming from one direction. So it is already half as much light on the plant as direct overhead lighting.

Thanks for the reply's guys, I'll be getting a 4' shop light when they come up.