Hello,
Great, that sounds good, the bulb will still be emitting UVB pretty strongly. Be sure it is 6-8 inches from him without screen or mesh.
For now, you could give calcium 4-5 days a week for a short while to get his levels up, then back down to 3. Just monitor his urates to be sure they don't get too hard or discolored.
Just give a small pinch, once daily either on his salad, feeders or mixed with water or diluted cranberry, apple or grape juice.
Let us know how he is doing.
Tracie