Originally Posted by
Richard Cranium
Another issue - that needs additional "light" - is the fact that led circuits can be optimized for exacting voltages. Operating a "blinkie" on
(~2.5V-2.8V NiMH) as opposed to 3V alkaline battery source could affect performance.
The 1.5V is a bit of a myth. Alkalines average more like 1.2V over their discharge curve. You are better off running NiMH as they supply a higher voltage for most of the runtime. Alkalines fall off more gradually though, so you get more of a warning to change them, NiMH can be quite abrupt.
Want really bright? Put 1.7V lithium cells in.