Involvement:Expert (understands the inner workings) - Ownership:less than 1 day
This lens performs a function that is otherwise hard to find: it focuses light into a line or rectangular shape. This is good for a bike light, were you want to be visible from front left and right but do not care much about being visible from above or below.
The lens needs some distance from the LED: approximately a centimeter between LED dome and the back of the holder. The problem is the holder then shields a lot of light. So it is better to use this lens without the holer.
I will use theis lens (without holder) in front of the lens sku.1920. This gives a beam that is suitable for a bicycle. sku 1920 feeds nearly all light from the LED forward, and sku 1918 mages it into a rectangular beam.
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