Quick point on rear lights:

- fog lights must be separated from the brake light by 4" on centres
minimum. My preference is for outside side lights, inside brake
lights, and outside fog lights - so a 'stop'n'tail' lamp in the side/
fog position.
- fog lights must be symmetrical, central, or fitted to the offside
only.
- indicators must be amber; they can be contained within the same
enclosure as side or brake lights, but you can't change the colour of
a light which is on (e.g. turn a red sidelight amber when indicating)
so you need separate LEDs even if interspersed on the same circuit
board.
- from memory, the only rule about reversing lights is that you can
only show them when actually going in reverse - again, you still need
to show other lights

Most LED light units are flashed at high frequency (a few tens of
hertz) because the LED is perceptually brighter when overdriven in
short pulses than run continually for the same average power. I find
this tends to irritate; as my eye moves across one of them, I see it
in several places flash-flash-flash which is most disturbing.
Similarly with the slower rate flashing bike lamps (an exception
allows these on bikes) by all means fit them but *please* also fit a
solid light. The flash raises attention but is so short that it can't
be located; I'm sure you'd rather I knew where you were than spent a
few seconds looking for you!

Neil

p.s. the LED lights on the back of the current Mondeo are rather nice.
But my favourite is the back of Guilietta!

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