They do.  The B&M Luxos U has a built-in capacitor that holds the charge.
The capacitor was added to regulate the voltage for the USB-charging
function.  But it also allows the light to hold on to a small charge when
you pedal below the charging threshold.  The Luxos U LEDs can provide some
light even when you stop (at a low level and for a limited time).

However, the Luxos U has some other drawbacks, notably visual artifacts in
the beam (due to the very-wide-angle reflector), and issues with the
plastic housing (durability and possible water intrusion).

The IQX followed after the Luxos U, but it doesn't have the USB-charging
function (and therefore no capacitor).

On Sat, Oct 20, 2018 at 1:48 AM Lum Gim Fong <[email protected]> wrote:

> As I commuted home tonight I was wondering why in 2018 they can’t invent
> dyno lights that don’t flicker.
>
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