Alan wrote:
I had exactly this problem and replaced both 6a MCBs with 10a versions and
it hasn't tripped when a bulb failed in 2 years so far.
Quick "upgrade" and very efective cure, while still protecting the lighting
circuit.

But could be risky and probably doesn't conform to the wiring
regulations as very many light fittings are rated to be protected by a
6 amp *maximum* circuit breaker.

--
Chris Green )