Thanks Bonzo75, this is obviously a pretty basic aesthetics question vs a more important functional one. As such, it's NOT overly important that I get a quick response. Hence, I thought if others had used a different bulb or done something to ameliorate their light output, they may reply here -- and of course, if Ralph saw this, he may reply -- and by doing so may help others.
I must add that I have had many direct communications with Ralph Karsten before and after my MA-1 purchase and have found him to be most receptive and rapidly responsive. Ralph is indeed generous with his time and knowledge both directly and on forums such as this. My difficult-to-drive with aplomb Soundlab M1PX speakers, simply thrive on Ralph's (Atma-sphere) OTL power!
BTW Bonzo, I've enjoyed your posts. Until recently, we both owned Golden Gates and your posts about Lampizator in general and the GG specifically were appreciated.