Sorry guys - I've been away...
The Carley 706 seems decent with 2 x AA NiMH in the MM, as it is rated at 2.4 volts.
The 803 is rather bright on AA lithiums, as I suspected it would be.
Both lamps look white to my eyes, and are an improvement over the stock MM lamps.
These lamps are both a bit larger that the stock T1, so I drilled the reflector just barely enough to accept the lamp.
The 803 runs hot on lithiums, and with little clearance between lamp and reflector, heat damage was observed. No such problems with the 803 & AA lithiums in the Nexstar 2AA, as the hole is suitably larger.
I do not have a Nexstar lamp to compare these Carley's to.
Beam quality is marginally better than the stock lamps, and with a little WriteRight or texturizing and some Teflon tape to eliminate head wobble they'll focus fairly well for better throw.
BTW - The 803 also works OK in the 1 x 123 Garrity Stainless 2AA mod.
Hope this helps - John