At the radio station the two outer lamps are GE Chroma 50. 2 inner Philips Colortone 50 ( a Westinghouse color). One of the Chroma 50s was barely lit (2 lamp rapid start) so I replaced it with a new 5000K CX50. 2900 lumens. WHOO boy...way brighter than the other 3.  

LOG = Loss of GAS !!

Just leaked in air ? How long they been there ?

Will it still light? It may on a neon sign tranny.

It had been in there quite a while. It lights dimly. Gets as hot as the full brilliance one.
No aging darkening.

That sounds like slow vacuum loss.