Wherr did you get the claim that 100k cd is over 1 km? For example the Acebeam L35 2.0 has 105k cd on turbo, and claimed distance is cca 650 m. The calculations are, well, a lot more complex than "times 10 and done".
this post was submitted on 06 May 2026
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Hmm I was remembering 1km for a 100kcd light but yes it looks more like 632m. See here: https://davestechreviews.com/2020/05/26/converting-candela-to-throw/
Also, what is so great about the SB90.2 LED? Convoy and Hank charge quite a lot extra for it.
It's a small light emitting surface relative to the amount of power it can take, i.e. it usually results in lots of output and throw. Companies charge a lot for it because it's expensive for them to buy. Looking at the layers of metal and glass and the 24 bond wires, it's probably expensive to manufacture.
The newer SFT90 costs a lot less and does about the same thing.