John Larkin wrote:

On Sat, 6 Dec 2008 09:45:19 -0800, "RST Engineering \(jw\)"
wrote:

Because I was already taken for an (I)ncandescent Lamp, and I was used
because L (Lamp) had been assigned to Inductor a great long time ago.

I recall lamps being DS.

LP here I think.

Graham