Product review (5 stars): Norweco AT1500 Alternative Bulb
Is listed in the ad as 39watts but the bulb itself reads 38watts, perfect for me as I was looking for 37watts and this was as close as I could find. Glad I took the chance, it is an almost identical replacement.
Using for replacement bulb in a Norweco At1500 , their part number is UV000105 - which is impossible to locate independently.