Just a quick update, I got a pair of the opal 75w bulbs from B&H and ran the enlarger for 15min with it on and it only got to a warm level so very safe for my students who got a chance to print with it today. Nice crisp prints with its factory lenses stopped down. The brand of lenses was also Mars branded. I am still on the lookout for a nice bright LED alternative though and will report back once I get some time to shop around.