Brighter tail light bulbs

A while back there was a post on here listing brighter tail/brake light bulbs for the XJ6. They worked well (not LED) in my '84 XJ6. Now I can’t find the part number for my current XJC. Anyone know what it might be? TIA

Have you cleaned the lens and reflectors?
Probably difficult to find something brighter that 21w standard, just google for the brighter lamp with the right socket.

OK, thanks

Chuck Welch

the best you’ll as suggested for a bayonet fit is 21/5W but narva make a 27/7W but wedge fit only