There is also a significant difference between the bicycle lamps and their performance. For the little 2W bicycle lamps (cheaper than 5 EUR) the view is mostly like this:
And the high end bicycle lamps of 45 W, often working on induction or are attached to the battery of electricical bicycle give the best view:
In the clustering this performance difference has been taken into account. During the project I will only focus on the low segment bicycle lamps.