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Mass: 63 g (with serrated washer, nut and 2x AAA batteries).
See the camera settings page for more on the setup and settings to make pictures of the beams of taillamps.
Out of a corner (showing how much light is cast upwards, forwards and to the sides) [ F3.9 & F1.8 ]:
Wallshot (showing the beam pattern):
Visibility from various angles (0°, 45°, 90°, 135°) [ 0.5m, zoom x3, F3.5, ISO80, 1/250s & 1/60s ]:
I took this lamp off of a bicycle. I replaced it because the switch was unreliable in switching it on/off, namely a bounce effect, so that the lamp went on again immediately after switching off, and vice versa.
The lamp has point source of light which is a very bad thing. Estimating distance is impossible, and at short distance other cyclists are annoyed (I wouldn't say blinded as the lamp is just too weak for that), visibility at large distance is poor. Visibility is poor from any direction as the pictures indicate.
Battery version: Lights up very weakly, no real optic that distributes the light from the LED in a proper way. Visibility is therefore poor and at close range it annoys following traffic. I wouldn't buy this lamp. Whether the dynamo version is brighter doesn't really matter as visibility is poor at long distance with all such point sources and due to the annoyance it gives others at shorter distance. Don't buy it!
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