A few comments about the FireSword-IV

The LEDs are being driven direct drive, from 14.4v, using four 18650 batteries. The brightness is fairly constant until the batteries are fully discharged. Highly recommended to use protected 18650, and they need to have nipples on them like regular batteries. If nippled batteries are not available, magnets can be placed in between each battery, and I can supply the magnets if needed. Protected 18650 batteries will cut out when voltage of the battery dips below the programmed level. Run time should be about 1 hour, constant brightness.

This flashlight does get very warm, but not so hot you cannot hold it. The head is massive, and the body is also massive, being 1/4" thick (.75 ID, 1.25" OD). Both the head and body are integral part of the heat sinking, and also your hand (if ungloved).

I have used four P7 LEDs in a 3" diameter head, with no overheating problems. This head is about 2.5" diameter, and 3.5" long, and has as much or more mass as the 3" diameter head I had made for the P7 LEDs. I'm using the Cree MCE LEDs because I can use smaller 20mm reflectors, thus making the head smaller than I could with the P7 LED, of which I have to use 27mm reflectors. Brightness in either LED is identical. Send email to: Elektro Lumens

waynej@elektrolumens.com

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Web page last modified December 17, 2008