WA01103-U and WA01165-U bulbs are very close match and for some reason, M*g rerate the life to 50 hrs.
BTW, old version MC bulb was 8 watts possibly WA01116-U
I have a few of these older 11 watt bulbs. They have straight arms supporting the filament, just like the one in the picture. They were the version made before the 2002 change to the 90 degree angled support arms.
The ones I have seem to be made by GE, as one has "
GE 78736" printed on the glass, and the other says "
GE 78794". Neither of these numbers yields any information on-line; maybe they're lot numbers. They test at 10.75 watts, pulling 1.76 amps at 6.1 volts. Back in the day, Mag quoted them as 11 watts and 30,000 CP.
None of my newer post-2002 90 degree angle style bulbs have anything printed on them, and I think it's now obvious, considering the info dated 2003 in the PDF, that they are indeed made by WA. They test at 10.25 watts, pulling 1.68 amps at 6.1 volts, and are whiter and tighter focused than the older GE version. Mag quoted them as 11 watts and 40,000 CP.
But Mag changed the bulb again in 2005, quoting the new specs as 8.4 watts and 51,700 CP. I've never seen or tested one of these bulbs, as I'm still using my surplus of post-2002 models. I have noticed a few people on Amazon complaining that the new 8.4 watt bulbs don't seem to be as bright as the previous version. But, of course, it's going to be difficult for the average Joe to accept that a a higher efficacy bulb can use less wattage and still be brighter, so possibly it's only their imagination. Anyway, a higher output, lower wattage bulb seems to further suggest WA as the continued manufacturer of the new bulbs.
Fivemega
Any idea what year Mag switched from the 8 watt version you mentioned to the 11 watt? I got my first MC in 1996, and my owners manual had the same page you show above, listing the bulb specs as 11 watts.
for anyone interested
-page 11 of this PDF of the newest MC owners manual shows the new 8.4 watt bulb
http://www.maglite.com/pdf/CustServ/RCH_Eng_WHS_6_0411122004314012.pdf
-this page lists most of the Mag bulb improvement info, with footnote #3 applying to the MC bulb
http://www.maglite.com/highintensity2_new.asp