Zen Katana E-bike Light (DOT compliant)

Ravi Kempaiah

Well-Known Member
Thanks Ravi, I realized after I posted that I was mixing volts and watts in my head. :)

Your light sounds like a huge upgrade from the 150 lumen / 50 lux Skybeamer that is stock on my Haibike.

Indeed. It will be a worthwhile upgrade, especially if you commute or go on rides in early mornings or late evenings.
You're welcome to visit Paul's office in Ashland, OR to test this out.
Paul has a small warehouse and office and you would enjoy trying out one of our bikes.

Zen office1.jpg
Zen office 2.jpg


Well-Known Member
Western WA
Thanks Ravi. Yes, my commute is in the dark 1 direction now and will be dark both directions by the end of the month.

I'd love to check out the light and one of the Zen bikes in person, but Ashland is a bit of a trek from Seattle in these covid times. Maybe in the spring/summer....

Ravi Kempaiah

Well-Known Member
If you are an E-bike nerd, you will enjoy reading this article and learning the nuances of the light certification process.
Fascinating things like:
  1. How is beam cut-off engineered for certifiable lights?
  2. What is an approval mark?
  3. How are E-bike lights tested for EU/StVZO standards?
  4. What should be the UV resistance of these lights' shell material?
  5. How high of a temperature these materials need to endure?
Full document here: https://unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/2013/R113r3e.pdf




Well-Known Member
Got excited... thought Zen was making a light ebike, not an ebike light. :)
I know everyone is different and this is my personal observation, but I'm fine with average 60 lb ebikes.
I have never had a moment where I thought I'd tip my bike over or fall down because of weight.

On a motorcycle, yeah even relatively lightweight 400 lb motorcycle can be intimidating especially for beginners, but for ebikes.. I honestly can't tell much of a difference between ebike and normal bike in terms of weight.

I know that some people might carry up stairs on their apartment, and if that's the case that's totally understandable, but I think 60 lb has been okay for me as far as the riding goes.


Well-Known Member
I'm half in/half out of the ebike world. I use my regular bike on shorter rides and rides without hills... I use the ebike on hills and long rides. It would be nice to have one bike that I could use for all rides.
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Well-Known Member
Curious to know what is your definition of a light E-bike? :)
Definitely less than 40lbs... 30 to 35 would be ideal.

Cannondale has 2 rear-hub bikes, the Neo Treadwell and the Neo Quick SL that are both around the 30-35 lb range.

The Specialized Vado SL is also in that range but that's a mid-drive bike... and I actually prefer rear-hub for cost control and maintenance.
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Ravi Kempaiah

Well-Known Member
In case you haven't checked them out already, see about Roxim Z4E lights for a good value priced model. DM inbound

Roxim, Lupine, Supernova are all great lights. It's a matter of not just features but also the price point.
The Stromer ST5 uses the higher-end Supernova but their ST3 uses Roxim light. Sticking with one supplier helps with building a deeper relationship and get volume pricing. So, in the end, we are focused on providing the highest value to the end user.