"Keith G" wrote in message
...

"Philip North" wrote in message
...

What colour is the light? Could it feasibly be some other form of
discharge
lamp? Neons are commonly used in cheap automotive strobes. The good
ones
have
the same as electronic camera flash heads...what's that, xenon?


The light for looking at the strobe lines on my DD75 is orange. Does it
have
to be a special bulb? As long as you can see the lines clearly through
the
little window does it matter?



No!

(As long as the lines aren't whizzing round too fast!! ;-)

Tell him to keep chucking any old bulb in until he finds one that doesn't go
pop then. If he's in the UK Halfords will be full of them, especially in a
fetching "Chav" blue.