OK - so some initial comments after some initial rides with some specific objectives in mind.
(1) Surprisingly - the wavelengths produced by these seem to have little or no effect on reflective or retro-reflective msterials. That includes stop signs, road markings and automobile reflectors. Haven't decided if thats a plus or minus since I never had any intentions of using them on their own anyway.

(2) The diffuser optics convert the horizontal beam to give at least a full 45 degree coverage on each side while confining the vertical coverage. The result is that at night, relative to a 10W 15 degree spot headlight (white), they appear less bright only when viewed head-on, and actually appear equally as bright when viewed from a 15 degree angle and brighter when viewed from a 45 degree angle. In spite of only having a 3W output.

(3) Daytime performance is similar across the same angles of view as night-time except that the 10W white headlight appears to have much less of advantage when viewed head-on. I'm having some issues with photographs simply because of the limits of digital sensors. Any exposure that doesn't seriously underexpose the photograph simply results in the amber output appearing white simply because the sensor has been overloaded and that part of the photo burnt out. Same with the red LEDs. Eyes interpret things very differently.

My initial interest in these was as fork mounted daytime running lights with the expectation that the color and lower mounting position would make them more visible in a worst case scenerio - riding with the sun at your back (which puts maximum glare into the eyes of oncoming motorists). So far it looks like they'll be effective for that.