I actually took out the lamp all together already. They are doing good without it. As long as they are inside I don't think that they really need it because its warm already. But right now the temp. here in always going between 20 and 40, it needs to get warmer because they are growing fast. And another question someone might be able to answer for me, the other day we noticed a lump quite large on their chest only on one side, but its on all of them. I don't know what it could be, I turned them everyday 3 times a day. Then they got out all right.
A lump on one side of the upper chest is a full crop. The crop allows them to gorge when food is plentiful. It's normal for them to load up in anticipation of night. As long as the little piggies empty it out overnight, they are fine. If it isn't emptying, that's when you have to worry about whether they could have eaten something that has them bound.