Flashlight bulbs (E what?)

There is no such thing as a 'Standard Flashlight Bulb'. Flashlight bulbs are typically rated based on the number of cells (batteries) in the flashlight, two, three, four, five, for example.

Peter & VJP-

I agree that there is no standard. In addition to the number of cells, bulbs are often "prefocused" while some are not, and may have plain, screw-in or bayonet bases.

I found a Sears Craftsman LED bulb, that is supposed to work as a replacement for prefocused incandescent bulbs in flashlights with one to five cells (1.5 to 8 volts). It is their stock number 34-93044, "Variable Power L.E.D. Upgrade".

I tried it in an old flashlight with two C-cells. It was brighter than the old bulb, but does not compare to a good 1-Watt or 3-Watt LED flashlight. In addition, it costs almost as much as one of those.

You may or may not be able to use one of these with a bicycle generator. My generator produces alternating current. I could only use a half-wave rectifier to convert its output to DC, since one side of both the generator and the bulb are connected to the frame of the bike.

Fred

The LED is it's own half-wave rectifier -- at least at low volts and low current. Elsewise it'll be a used fuse. :-)

But, you might want to use a half-wave rectifier _and_ a large uFd capacitor to smooth out the ripple -- which, at bicycle speeds, would cause a significantly annoying flicker in the light output, IMO.

Jonesy

Ok, but my question is what is the socket. Radio Shack sell sthis bulb (which was for my bike) as incandescent as "standard flashlight bulb". I appreciate the scemantics, but what is the socket for this bulb here:

Thanks

Not sure what is your question; but if you click the 'features' tab (not the 'tech specs' tab) on the page above, you get the voltage and the description of the base as 'threaded'. IME, that threaded base fits a threaded socket which is universal for flashlights...that are threaded. One size fits all, regardless of voltage (2.4 in this case) or other parameters.

Interestingly enough, the 'features' tab also lists an average life of just five hours. A new bulb at each battery change....?

jak

E10 or MES - miniature Edison screw. But not all flashlights use this.

This may be some help:-