Russcoles wrote:http://www.sjscycles.co.uk/b-and-m-light-bracket-for-fork-crown-254mm-mount-493ghpb-prod22455/
Should work to attach any handlebar mounted lamp.
Or take a piece of PVC pipe the right diameter and drill a hole in it, bolt this to the rack and put your light on the pipe.
I took your advice on the PVC pipe, but instead of PVC pipe I cut a length of broom handle and drilled a hole through it to attach to the hoop.
Thanks
George