Re: What bulb voltage?

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.
.

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