Such as this one:
how are the LEDs configured? Are they paralleled? Each with a series resistor? Regulator?
In this application, the source is 2.4-3.0 volts, depending on type of cell. Any idea?
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Low-cost flashlights often use battery (coin/button-cell) internal resistance for current limiting. Seems to work OK in practice, although probably somewhat less than optimal. For
There are switched mode power supply ICs designed to drive white LEDs. It could well use one of these. Certainly that would give the constant light output they claim:
"The light output of the NewBeam LED module maintains a perfectly constant level for almost all of the batteries' useful life"
For an example of such an IC have a look at:
Gareth.
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I have two Opalec Newbeams installed in my mini maglites, and I use them all the time.
The Newbeam is not focused, so turning the head of the maglite does nothing but turn it on/off. There is a circuit encapsulated in epoxy, so you can't see what's in the circuit. My guess is that there's a chip in there and the three LEDs are in series. Buy one and find out. Another model is the Techass MagmaLED which is a single LED, and it is focusable.
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