This Cateye light set conforms to British Standards.

Rear has inbuilt reflector and threaded screw for mudguard or reflector bracket mounting. The lamp also works with the supplied bracket (on the seatpin or seat stay) and has the expected flashing/constant modes.

The front lamp is halogen - a warm quality lamp that works nicely with the supplied batteries.
 

What are British Standards?  With bicycle lights this usually means a reflector. Reflectors are a lot brighter than lights when seen in headlights and you might want to upgrade yours with this light set.