The "Digital Series" M2D with a lamp voltage regulator (LVR) are in the 2002 catalog, but they don't seem to be available yet. The LVR is supposed to provide constant light until the last 15 minutes of battery life. They it provides 15 minutes "emergency illumination" so you can find your spares case or employ your backup light.
I'll search candlepower forums when I get home and if I don't find an answer there I'll post another inquiry there.
I'll search candlepower forums when I get home and if I don't find an answer there I'll post another inquiry there.