This light fits Bromptons with a rack as well as those without - it simply replaces the rear reflector (and has a reflector built into the light)

Replaces the rack-mounted rear reflector and brake calliper mounted rear reflector

This Brompton LED rear lamp with integral reflectors is designed specifically for Brompton and gives a good bright light: this light stays fixed to the bike. The lamp replaces the rear reflector. The Brompton rear light is shock and water-resistant and despite giving visibility up to 400m away the batteries should last for up to 60 hours.

Two modes: On / Off (no flashing mode)

Batteries (2 x AAA) are not included - replaced by unscrewing the two screws on the front (lens) of the lamp with a Philips type screwdriver.

The Brompton rear light can mount to the R-type (with mudguards and rack), L-type (with mudguards) or E-type (no mudguards or rack) - i.e. it is compatible with all Brompton models - it just replaces the rear reflector and adds a lamp functionality.

About the mounting brackets:
If you have a rack fitted then the brackets holding the reflector will hold the light - unless it's a really old tubular rack which will require rack mounting brackets and for you to drill a hole in the rack.
If you don't have a rack - then you can use the "Y" shaped bracket (mounted on the rear brake calliper) which holds on the rear reflector.

Weight (g): 85

water-resistant and sturdy; sideways brightness is also good.