Bicycle lamp used for road lighting is becoming popular now. However, few people have realized its potential market
and correlative researches are far from enough. Generally speaking, researches on bicycle lamps are mostly focused on
how to design a reflector which will collect light energy more efficiently and can transfer it to certain areas forward
when the light source is determinated. In traditional angle of view, the reflector is usually a paraboloid or ellipsoid.
However, both of them can not meet the requirement in practice most of the cases. Therefore, free form reflectors (FFRs)
instead are widely used. In this paper, a new approach to design FFR which is convenient and rapid is presented. To do
computer-aided simulation, certain light source should be selected first. Usually, light sources that behavior like a
Lambertian emitter are modeled. To examine the correctness of this approach, a bicycle lamp is designed according to
this approach to see if it can meet the requirements of the Germany standard which will be introduced in the text later.
The standard requires specific illuminance values for particular points at the test screen with a distance of 10m from the
source. The simulation results is exciting and can meet all the requirement. For example, 10lx is expected at the point (0,
0) while the obtained value is 10.42lx, under the conditions that the total luminous flux of the light source is 42lm and
the reflectivity of FFR is 0.8. This method has certain universal significance and can provide references for the design of
other illumination systems.