The IQ-X (100 lux) has a sidelight function, although not all that bright. Would reflectors be an option? Some tires have reflective sidewalls, such as Schwalbe Marathons. I have a bunch of
Lightweights reflective tape bits all over my main commuter bike that I like to think makes me more visible. Includes some on my shoes for movement. I also use a Light and Motion Vis 360 Pro headlamp (
Link) on my helmet that has a side light function (thus the 360 bit to the name). Not exactly a brilliant side light either, but an option to consider.