Hard to tell for sure without a close look, but the roofing / waterproofing material looks like TPO, a single-ply roofing membrance. It is not made for direct traffic, so appears someone has installe ... read more
Bulb info should be on base of bulb. Many internet sources for older and unique bulbs. May want to use multimeter to check contacts of socket to be certian power is reaching an inserted bulb.