Rear lamp: B&M Toplight line plus


StVZO approval no: K659 (on reflector) + K658 + K751
Mass: 52 g (with lock nuts).
Size: 93.5 mm width, 44.7 mm height, 16.8 mm thickness.
Light source: 2 red LEDs.
Mounting method: On the rear rack, 50 mm bolt distance (80 mm is also available).
Cabling/connectors: There are 2 connectors for 2.8 mm female plugs as used on standard double strand wires you can buy from a bike shop, you can also use wires without connectors, remove the insulation at the ends, and clamp these in the lamp with a lever.
Construction: Plastic, housing cannot be openend, with galvanised bolts sticking out and stainless steel lock nuts.

Price: ca. € 25,-


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


Wide light, whether that's through an actual surface or a pseudo surface created with separate bars doesn't seem too interesting to me. I will however do tests to see if there is a difference, e.g. for estimating distance. What is noticeable is that the Toplight line plus is not annoying, no sparkling effects in your eyes at a short distance from the lamp, in contrast to the Toplight flat plus and the Toplight flat S plus. This is my favourite of the B&M rear lamps.

On the rear you can see a small red piece of plastic which actuates a switch that switches off the standlight. This is to make a bike stand out less and can be done with newer versions of the Cyo too. I'm not sure how useful it is. Standlights are not new, many bicycles have a standlight, since many years before the Line plus was introduced.

This is really the nicer version of the flat S plus: No loose junk (hardware or stuff to fasten cables) and a bit smaller/lighter. I'm not sure why this one is so expensive. Why can't B&M just nuke the flat plus/flat s plus and the gazillion versions they are made in and just sell this one for the price of the flat s plus?

Annoying for following traffic until which distance?: Not annoying at all...
Visibility: Good.
Visibility by reflection: To be tested.
Ease of connecting wires: Very good for bare wires (with a lever) as well as for 2.8mm plugs.

When I measured on a 6V direct current source, the current was only ca. 20mA. I need to check this for an alternating current source (dynamo) because 20mA does not conform StVZO (the minimum according to StVZO is 0.3W at 6V, i.e. 50mA).

Design- and thus review considerations for taillamps

See Theory for taillamps.


For the price this is sold for, it should come with stainless steel bolts.

This is my favourite of the B&M rear lamps, and in fact the best one I've tested so far (i.e. until mid July 2011). Recommended.

Note: I heard from 2 people that the standlight in their Line plus didn't work any more due to a bad/intermittant contact. After that I found some more messages on German websites about this problem. You can't fix such things as the lamp can't be opened without damaging it.

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