Assuming a correct assembly: This light provides a bright environment with mixed lighting (urban transport, street lights, traffic lights) for being still perceived. As a frequent-driver could wish for in some situations and weather conditions (rain, fog, cyclists with light-absorbing clothing) to perceive cyclists better. For this reason I am going in the fall / winter in city driving only with this smart LED when I'm traveling by bicycle.
On lonely country roads, this light ensures that you will be perceived as a cyclist as an equal participant. Many probably think that a motorcycle or moped is running ahead. From personal experience I can tell you that you will be perceived even in about 250 meters. The light blinded me as motorists not stronger than other automotive tail lights - as motorists displays a rear fog lamp improperly used.
Only when driving in convoy (Marathon, excursions, etc.) do I upgrade to a weaker light, since the distance is often less than 1 meter the nearest cyclists. Here one would wish a dimming function.
From a distance of 4-5 meters, the cone of light is wide enough so as not to dazzle, but good to signal to the rear. The signaling effect to the side has been criticized in some reviews often. Compared to cast backwards brightness, the brightness given off to the side, in fact, is very low. Compared with other LED taillights but quite comparable. Two small LEDs radiate laterally, also the central Smart LED reflected in the housing cover so that sufficient lateral visibility is given. Even with somewhat weaker batteries the Smart LED taillight is aside brighter than comparable LED taillights.
Function:
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Cover pry (with a coin This is very easy), two micro batteries (AAA) Insert, Replace cover and press the button. The button switches between continuous light, flashing mode and Off. I use Eneloop batteries and am pleasantly surprised by the endurance - in relation to the output brightness.
The casing is well protected from rain and spray. The mounting bracket and housing are solid form. Basically, taillights enjoy great popularity in this form, since the holder is regarded as very solid and the tail light projecting only slightly from the wheel. Therefore, I have specifically looked for a tail light with this form factor.
Price-performance:
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For less than 20 euros, there is no rear light with comparable brightness and longevity.
Conclusion:
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This is about the "being seen". This claim meets the LED. A somewhat flächigere illumination would increase the benefits. A dimming function (dimming instead blink) would extend the field of application of the LED significantly.
For STV (Z) O problems:
Very few LED taillights have a roadworthiness approval, as LED front lamps are usually "allowed" only as an additional light. This is mainly due to an outdated legislation. I am not aware that you can purchase for example. A STVZO enabled MTB sale (dynamo powered front and rear lights). Often, therefore, remains only as a way to carry a battery-powered lighting. In practice, the result is usually that battery lights are "tolerated" because driving without light is inherently much more dangerous.
