Both - I mix it up
forward
niterider classic headlights on solid
rearward
superflash on seatpost SOLID
LD1000 on rack on FLASH
led on seatpost on FLASH
superflash on helmet FLASH
LD1000 on courier bag on FLASH
Optic cable lights on bag on SOLID
add an illuminite jacket, illuminite helmet cover and a bike frame where every rearward facing surface is covered in red and forward facing surface is covered in white 3m scotchlite tape and I'm pretty sure I can be seen from the international space station.