"It'd probably be best to keep them as they are, or at least fit replacement B15 lampholders, still seems to plenty of old stock of the 40w lamps on eBay. Keep an eye out for any made by Greenstock, they made a range of 8,000 hour golfballs.…"
"I stand corrected! Fortunately I haven't ordered my GU10 bulb holders yet so I guess I can look at the other options available to me. I do like that GU10s are reflector bulbs though. I've never been a fan of bayonet fittings.
I found this…"