Planet Bike Beamer 5: not much light.
Planet Bike Alias HID: lots of light, run time much shorter than claimed, returned it.
2 x Fenix L2D: less light than Alias HID but better run time.
2 x ShiningBeam L-Mini II: more light and better run time than the L2D.
2 x ShiningBeam S-Mini: more light and about same run time as the L-Mini II. IIRC, brighter than the Alias HID.