Hello Michael
The bulbs and sockets look correct and in excellent condition. There should be a dipswitch and a twin filament bulb which should ideally be a
6v 12/12w, and the pilot and rear light bulbs 6v 3w. The wattage is so low because the BTH dynamo kicks out a very small amount of power.
On my T6 I used a 6v 36/36w bulb and that gave me about an hours light before the battery went flat, but the light was at least reasonable. With the 12/12w bulb the current was balanced, but the beam hardly went beyond the front wheel. A candle in a jam jar wouldn't have been much worse!!
What you have got looks very original.
Cheers Richard