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Fresnel lens rear landing light? Wouldn't that be too dependant on position (height, mounting point etc.) that it would be impossible to get accurate dispersion? Your hardly going to get people pulling out rulers and spirit levels to mount a bike light.
Put the light on a bracket that has a ball mount, put a round spirit bubble on top:
Once set properly for a bike (a 10 second task), tighten ball bracket and you're good.
That would make the angle of the seat post or mounting point irrelevant.
As for height... the Fresnel could deal with minor variation in height... but let's face it, seat posts don't vary massively in height from floor so I doubt it would be a problem.
This is over-thinking it though... I'd probably actually design a vertical back of the light so that you can visually just see whether it's straight against any background (door frame, lamp post, etc).
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Velocio
@TRA
Moon Comets are OK - great light distribution and very visible BUT I have had 2 die within a year from internal corrosion. I pulled one apart to find the battery pack had swollen or melted and leaked corrosive shiz everywhere. But I like that you can recharge via a USB port on a computer etc.
Fresnel lens rear landing light? Wouldn't that be too dependant on position (height, mounting point etc.) that it would be impossible to get accurate dispersion? Your hardly going to get people pulling out rulers and spirit levels to mount a bike light.