Taillamp: Union 4365, rack mounted


StVZO approval no: K1237
Mass: 66 g (with washers and nuts).
Size: 113.3 mm width, 50.0 mm height, 21.5 mm thickness.
Light source: 3 red LEDs.
Mounting method: On the rear rack.
Cabling/connectors: 2 connectors for a dual strand cable with 2.8 mm plugs, or bare wires with the included plastic inserts.
Construction: Plastic, housing glued, with stainless steel bolts + nuts + washers.

Versions: 4460 for battery/rechargeable batteries, 4365 for dynamo.
Price: ca. € 14,-


Beam shots

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 ]:

Comparing taillamps


Power use: Starts of very high at more than 300mA, it drops to the standard 100mA only after 56 seconds, and after several minutes it stabilizes to about 66mA.

I ran it at 3V where it takes 22 mA, and is still as bright as any of the other good taillamps, so it could be made to run at a far lower current at 6V (11 mA, similar to what the Lumiring and Line plus use). 6 times the power (compared to 11mA) does not mean you experience it as 6 times as bright as other taillamps, but it is very bright.


In construction quite good, with stainless steel bolts, fairly good optics.

Very good visibility, it's too bright, power use is high compared to the best taillamps.

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