I'm using the DiNotte 300R, it is highly effective in bright sunlight. It is important for good daylight visibility to direct the light slightly upward and to the left rather than straight to the rear or downward. On a minor note the kit came with mounts for just about any tube size or shape, the quick connect fitting can bolt up with mounts from Nashbar etc., and being self contained makes for a neat installation. It was a much appreciated gift, no regret or envy for something else, however if I were to research for choice as pmartin4665 suggested, the Design Shine DS-500 looks to be about the brightest for daylight visibility.