Sigma Stereo achterlamp (accu)

Ik schreef op de hoofdpagina:

Wat betreft achterlampen met accu, die me normaliter niet zo interesseren, wil ik toch de de Sigma Stereo eens bekijken, die met met een USB stekker op te laden is en mogelijk goede lichtverdeling heeft.

Er blijkt weer dat het grotendeels voorspelbaar is vanaf productplaatjes en plaatjes van de lamp als hij aan is, of een achterlamp goed of slecht is. Vaak zijn plaatjes van de lamp als hij aan is niet eens nodig...

Specificaties:

StVZO goedkeurings no: K969 (alleen de niet-knipperende versie!)
Massa: 72 g (met accu's en O-ring).
Grootte: 74,7 mm breedte, 41,0 mm hoogte, 21,6 mm dikte (zonder het uitstekende deel voor de houder).
Lichtbron: 2 rode LEDs.
Montage: Op de zadelpen. Je kunt de hoek instellen.
Batterijen/accu's: 2x 800mAh AAA NiMH accu's met lage zelfontlading worden meegeleverd.
Constructie: Plastic.

Prijs: ca. € 30,-

Power: 24mA at 2x1.30V means 0.062W

Plaatjes:

I like how it looks, a lot less clunky than the Lightring taillamps...


Plaatjes van het geproduceerde licht

Zie de pagina over camera instellingen voor meer informatie over de opstelling en instellingen om plaatjes te maken.

Projectie op de muur vanuit een hoek (wat laat zien hoeveel licht omhoog, naar voren en naar de zijkanten gestrooid wordt) [ F3.9 & F1.8 ]:


Projectie op de muur (dit laat het lichtpatroon zien):


Zichtbaarheid van de lamp bij allerlei hoeken (0°, 45°, 90°, 135°) [ 0,5m, zoom x3, F3.5, ISO80, 1/250s & 1/60s ]:





Vergelijking van achterlampen

Ervaringen

The optics are pretty good, no blinding of trailing cyclists, the light is distributed very well over a larger area which is the ring around the LEDs but the LEDs light up a bit in the middle too (and not as a point source!). The light at close range can be annoying to some (I asked someone else to judge it too), so better distribution over a bigger surface is still what we need, not a higher intensity. There is a section of light in the beam that is nearly collimated so it gives good long distance visibility despite low power consumption similar to the Lumiring.

The rubber cap on micro-USB port is a bit hard to get off but even more difficult to get back in, but I suppose that means it will be waterproof there :)

The mounting method is by rubber band which Sigma thinks is cool for bike computers and lamps, but which in reality sucks harder than a black hole. The on-off switch is not as good as on the Lightring, in particular because of key-bounce (result: light going off immediately after pressing on, or not going off when it's on) and you need to press it too hard.

The included batteries are of the low self discharge type, charged and ready to use when you buy the lamp.

From a recent comparison with the Philips taillamps (see the comparison page on taillamps):

Long distance comparison of the Sigma Stereo, Philips Lumiring & Philips Lightring: I cycled towards them several times from ca. 300m, lights positioned at about 1m and another at near road level. This height difference didn't matter much in visibility... The Lumiring is best for close distance (not annoying, gives the feel of a solid object) and for long distance works just as well as the others, with very low power consumption, which shows the superiority of the optics and concept. The Sigma stereo also has a almost collimated section of light in the beam like the Lumiring which gives it long distance visibility with little power used. The lightring is perhaps a little better on winding roads (out of the direction of the 'almost collimated' part of the beams which go straight to the rear in a narrow cone, of the Lumiring and the Stereo) but the Lumiring is good enough. Do you really need to be seen further than say 200-300m if the road is meandering? It seems to me not, but if you have experience in such situations, and have some suggestions, let me know.

Conclusion

The Stereo has a good total concept (NiMH batteries with micro-USB port) coupled with smaller mass than the battery version of the Lightring and it looks nicer than the Lightring. Visibility is good, it doesn't annoy trailing traffic (some people won't like it nearby, too bright), the mount with the rubber rings sucks.

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