Re: What bulb voltage?


"John Popelish" <jpopelish@xxxxxxxx> wrote in message
news:baCdnb3HBszajx_eRVn-uA@xxxxxxxxxxxxxxx
> Richard wrote:
> (snip)
> > Point noted about different internal resistances of batteries.
> >
> > One wonders whether the bulb or battery industry ever produced a table
> > having suggested voltage ratings of bulbs for the various batteries.
>
> I think most small, low voltage lamps were designed with a particular
> cell type and number in mind. As cell chemistries have improved, new
> types have been added to work well with these lower internal
> resistance cells. However I have not seen a list of cell and lamp
> combination compatibility. But I'll bet it is available, somewhere.
>
> Most data is in the this form:
> http://www.mts.net/~william5/library/minilamp.htm
> http://www.oldradios.co.nz/data/index7.htm
>
> If you look at page 193 of this catalog:
> http://stevenengineering.com/Tech_Support/PDFs/27MAIN.pdf
>
> and look through the voltage and current ratings for the PR8 through
> CM395X, (all lamps designed for two 1.5 volt cells, I think) you will
> see a general trend that the lower the lamp current, the closer the
> rated voltage is to 3 volts. I think this implies that they expect
> lower internal cell resistance drop for lower lamp current. You could
> probably go to the cell manufacturer's voltage versus current curves
> and deduce what cell chemistry and size would produce these voltages
> at these currents. All these lamp designs were initially requested by
> some customer who needed a lamp for a specific application.

You know, when one starts out with an interest in electronics first thing is
messing about with bulbs and battery's. I did not carry the interest on
professionally, however, I never realised there was so much to say about
selecting bulbs given a certain set of battery conditions.:c)

I bought this halloween pumpkin with a lamp in it. It's run off two Duracell
AA bateries. Actually I bought two, and both bulb have gone already. I think
they are underated, I mean they must be drawing an overated current. But
when they were lit the light output was about right.

Okay, this is what is says on the bulbs: 2.5v 0.2A. Okay so the problem is,
how do you go about getting a bulb that gives the same light output, but is
not going to be current overated? Rich.

.

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