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I'm pretty certain there no lights that have "weight" sensors. The sensors for triggering signal changes use large induction loops to detect when ferrous metal (a car frame) is near by.

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Yep as I found out with my Carbon road bike, they don't see me (or a bunch of us) which can be fun.

A strong neodymium magnet attached to your shoe or one of your components should be enough to trigger the sensor for the lights, I've seen them work on scooters and small motorcycles.

This is an excellent idea, thanks!

Currently off my bike due to ill health but will suggest it to the cycling club.

No worries! Some people suggest using a stainless metal case around the magnet since they tend to oxidize a bit, but there are a few good guides around with ideas.

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