On 5 Jun, 13:30, "
wrote:
On Jun 5, 12:05 am, wrote:
On 4 Jun, 22:38, Derek Geldard wrote:

IKEA have *New*-ly started offering a light module with 3 very bright
white LED's in a single plastic capsule "Grosby" £2.99.

They are very bright and eminently suitable for repacing 10W halogen
capsules to illuminate double/single glass fronted display cabinets
which fails often and offer severe difficulty in replacement.

However they are powered by 3 AAA batteries.

I've measured the current consumption, they draw 56 mA from 3 AAA
cells in series. So I rekon they'll last one day or thereabouts.

So what is needed is a means of efficiently powering them from the
mains, that avoids the high power consumption and failure of the old
10W halogens.

I'm considering such tricks as powering them from 3 AAA rechargables
and charging them via a timeswitch or an electronic substitute so
that they charge only (say) 10% of the day (which surely should be
enough) to save energy. Given the heat losses in "Wall Wart" type
transformers.

Any better ideas from the panel ?

DG

Ick. Just use a wallwart that delivers apx 4.5v. So one rated at
around 3.5v or so will give around 4.5 @56mA.

Still feeling tired when you wrote that? Depends if it's regulated or
not.

MBQ

few warts are regulated.


NT