Re: http://www.worldpartners.co.th/LM70Super.html
just stumbled over this thread. Oh dear: I really
love calculations. Sorry, I can't resist:
- luminous intensity
ANSI distance is just as fine as luminous intensity. 3450/4250 m would be 3.0/4.5 Mcd,
while the normal LX70 has 0.93/1.3 Mcd.
And luminous intensity is not easy to determine anyway, if the measuring track is relatively short (e.g. in a lab)
Actual intensity might even be slightly higher then.
Theoretical max: double diameter => quadrouple luminous intensity.
- what about reflector/focus quality?
The picture suggested a reflector with ~196mm effective diameter (quickly comparing pixel distances in gif viewer
The LX70 with a 100mm reflector already has an amazingly high luminance: the light effectively makes available 170 cd/mm² "out the front".
The Fire-Foxes FF4 60W (59mm) makes available ~200 cd/mm², but it does so by overpowering a slightly smaller, low cost HID
(~3.8mm arc length instead of the typical automotive 4.2mm) and it will degrade faster. And the smaller reflector makes things a lot easier.
It's not easy to keep effective luminance with a much bigger reflector. Yet this LX70 variant seems to keep its very good values,
at least 150 cd/mm² "out the front".
- Maxabeam?
I guess requirement specs are just too different to compare these lights.
luminous intensity of the LX70SP would be lower (the Maxabeam has 6-12Mcd), but ~7500 lm would be much more flux than the roughly 1000 lm (1500 at best) of the MB.