Hi Bob.

My Ruby Handbook 1316A from November 1935 Lists:

Headlamps 618 S.V. Presumably a Lucas part number, the figures implying 6 Volts, 18 Watts

Side, Tail, Stop and Dash all B.A.S. No. 8S, which I have found listed elsewhere (1931 MG Midget instruction manual, 1928-31 Morris Minor data) as being 6 Volts, 3 Watts.

This seems to be in agreement with your information. I must admit, they all seem remarkably feeble by today's standards. Maybe in the thirties the nights were darker or people had better eyesight !

For completeness, The 1928-31 Morris Minor used a B.A.S. No. 1S headlamp bulb rated at 6 Volts, 12 Watts, and the 1931 MG Midget used a B.A.S. No. 2S bulb rated at 6 Volts, 18 Watts. I also have a listing for a 1939 Hillman Minx with Lucas Number 106 bulbs rated at a dizzying 6 Volts, 24 Watts and needing a Lucas C45NV dynamo to run them.

I confess that my own car has the dynamo set up to read 10 amps on the dashboard ammeter with the lights off (though I have never measured this current accurately) It has been doing this for at least the last 15 years so I can't say I'm unduly worried.

Location: New Forest