Cheap lights using CR123 batteries
 

Well,

Are there any? I need some backup lights, and it'd be nice to use the same
batteries as my main light.

Cheers,
tom

--
We are going to have to be speculative, but there is good and
bad speculation, and this is not an unparalleled activity in
science. [...] Those scientists who have no taste for this sort of
speculative enterprise will just have to stay in the trenches and do
without it, while the rest of us risk embarrassing mistakes and have a
lot of fun. -- Daniel Dennett

Cheap lights using CR123 batteries
 

On Sun, 16 Jan 2011 12:42:06 +0000
Tom Anderson wrote:

Well,

Are there any? I need some backup lights, and it'd be nice to use the
same batteries as my main light.

If you don't find something specifically designed for CR123 at a
sensible price, I'd have thought anything that uses 2 AA cells and has
a voltage regulator would do, with minor modification.

Cheap lights using CR123 batteries
 

On Sun, 16 Jan 2011, Rob Morley wrote:

On Sun, 16 Jan 2011 12:42:06 +0000
Tom Anderson wrote:

Are there any? I need some backup lights, and it'd be nice to use the
same batteries as my main light.

If you don't find something specifically designed for CR123 at a
sensible price, I'd have thought anything that uses 2 AA cells and has a
voltage regulator would do, with minor modification.

I might be capable of the requisite modification if the light had
firmware, but if it's hardware, it's very likely to be beyond me!

But very good point; for those playing along at home, CR123s are the same
diameter as AAs, a bit shorter, and twice the voltage (if they're the
rechargeable kind rather than disposables - strictly speaking, CR123A, i
think). Anything which can take two AAs can probably run on one CR123 and
some stuffing. Hmm.

The biggest challenge might be finding a rear light which runs on AA
rather than AAA.

tom

--
Gotta have skills to pay those bills.

Cheap lights using CR123 batteries
 

On Tue, 18 Jan 2011 00:44:38 +0000
Tom Anderson wrote:

But very good point; for those playing along at home, CR123s are the
same diameter as AAs, a bit shorter, and twice the voltage (if
they're the rechargeable kind rather than disposables - strictly
speaking, CR123A, i think).

3V is rather more than twice the 1.25V you'll get from a typical
rechargeable AA, hence my suggestion of a voltage regulator (which I
think you'll find in all but the cheapest LED lights anyway, but I
could be mistaken).

The biggest challenge might be finding a rear light which runs on AA
rather than AAA.

No shortage of cheap ones on eBay. Or you could just run a cable from
the front light.