Maker Pro
Maker Pro

The ultimate LED flashlight


Chuck Olson

Jan 1, 1970
I was wandering around Fry's Electronics recently and came across their
lengthy stock of flashlights. After trying a few, I decided one in
particular was worth a purchase. It was the Inova X1 and the designation
near the UPC code is X1MT-WT, which describes the white one I bought. I
imagine the WT might change to BK for a black one. But what's so
exceptional? It's just a perfectly simple cylinder with an LED and reflector
on one end and a rubber push pad on the other, with both ends the same
diameter. Press the pad or twist the cap tight to turn it on. Inside is a
single AA alkaline cell. The package specifies it delivers 25 lumens and it
cost me $18.99 plus tax..

Now we all know a white LED requires about 3.5 volts to light up, so this
flashlight must contain a highly sophisticated electronic circuit that
turns the 1.5 volts of a single alkaline cell into 3.5 volts and enough
current to light it quite satisfyingly bright. In fact the Energizer AA cell
in mine has been working for about 3 weeks, now, through many short searches
and a few long ones that really drain the energy from most flashlights. The
cell voltage is down to 1.26 volts, a level at which most portable
electronics just stop working, but not this one. The brightness is only 21%
down from when the battery was new.

To sum up - - this is a flashlight that works on cheap feed, lurks almost
undetectably in a purse or pocket, stays bright long enough to be
dependable, and drains the last drop of energy from whatever you feed it.
What more could you ask?

Chuck Olson

Chuck Olson

Jan 1, 1970
Thanks for the comment, Rob. You may be right about the ~0.9V end - - it
hasn't reached that yet, but I'll report how it did and to what final
voltage. What principals? Thanks, I'm just an old, retired EE that likes
flashlights, but I'm tired of all the overdesigned, overbright, oversize
lights, most of which I've already bought but never use. It's heartening to
hear this is the newsgroup where people know about these things - - I was
afraid I'd have to start posting in to get the
attention of a real LED fan. As to the cost, well, it was an impulse buy - -
guilty of not ordering it from the orient.