"Private" wrote in message
news:Y8%8f.351571$oW2.280247@pd7tw1no...
I will defer to more knowledgeable AMEs here for an "exact" definition if I
am using the term "certified" incorrectly .

What I meant was FAA approved replacement part as compared with similar
specification part lacking correct aviation paperwork. It is my
understanding that some owners install (but do not log) non-certified??
replacement bulbs due to much lower cost.



There is a current thread, subject "Landing Lights at NAPA", on
rec.aviation.owning that discusses this subject extensively.

Happy landings,


"Mike W." wrote in message
...
What is a certified bulb, exactly?

"Private" wrote in message
news:fuP8f.345716$tl2.15531@pd7tw3no...
snip
I would think that owners who are not as fussy about
using certified bulbs are more likely to use the light for safety.