Malkoff M@Glite XP-G2 drop in regulation question

calviroman said:

Hello,

So I have a handful of Gene's P60 drop-ins for my SF lights and am considering getting a few of his XP-G2 M@g drop-ins for my D-cell M@gs. My question is regarding regulation, draw, and runtime. From his site:

"It uses a genuine Cree XP-G2 LED. This dropin produces a real 300 (measured out the front) lumens with alkaline batteries.The Drop-In module...and has a regulated driver. The current output to the led is 1000ma on 3, 4, 5 or 6 D cells"

So with a 3D, the regulation circuit sees 4.5V and draws 1A (4.5W consumption). With a 4D it now sees 6V and does it still draw 1A (6W), and with a 6D it sees 9V and does it even still draw 1A (9W)? If the answer is yes it always draws 1A as Gene's site eludes to, then is the extra power giving more lumens (>300) or is it wasted/lost as heat by the regulation circuit? I would hope/think that the regulation was designed to make good use of the added cells in 4-6 D applications. Thanks.

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Scourie said:

The current to the LED is constant, not the current from the batteries. As the battery voltage rises, the current should drop.

Rob

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Scourie said:

In essence yes. More batteries will give longer runtimes.

Rob

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calviroman said:

Thanks for the replies. So sounds like the regulator circuit will pull a varying amount of current off the batteries based upon the battery input voltage presented to it. It would be good to have a chart for these drop-ins showing input voltage verses current draw from the batteries as regulation circuits are typically more efficient at certain points in this curve.

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