When we bought Willow it came with a beautiful car head lamp which Simon had bought to wire in as a tunnel/ head light. So far we’d not used it, relying on a 240v flood light for night boating.
During the week, James had a bracket made up for it by the ever useful Mackays metal-work shop. It will be demountable because the light is very shiny and nickable.
Today he worked out the wiring for it and connected it up temporarily- it’s a little complicated as it’s an auto headlight. It can be dimmed and so it has 4 wires coming out of it. But weve worked them out now so we can dim the lights when approaching another boat in a tunnel!
M. B. Willow 
Great lamp. You need to be able do dip it upwards to the roof – dip it down and it reflects off the water!
Oops, it doesn’t dip, it dims! Typo! It has two bulbs, one dimmer than the other.
What a marvellous lamp!
if there are two bulbs or filaments then it probably does dip because the centre of illumination will be off centre in “dipped” mode. Hard to explain!
Yes I see what you mean. Will have to investigate!