Advice needed - how to build a 50%/100% dimmer simple

[-LightOn-]

Hi,
I have a buck-driver that has a pwm-input. My light has a clickie type switch and I would like to be able add a low mode to my light. Is there a simple way to build a 2-mode dimmer with 50%/100% output?

I've looked at the timer 555 circuits which can provide a 50% signal but how do I incorporate the 100%-mode without adding additional switches?

And no, I don't want program my own controller.

 

[hopkins]

If you can identify the resistor that controls the width of the pulses
you can wire in an additional resistor + switch
to either double or half the resistance and thus control the brightness.

May be a capacitor that will be easier to add to control brightness.

 

[-LightOn-]

Yeah. That's the easy way of doing it, but requires the additional switch I don't want to add to my MTE lamp body.

I thought of using a 555 time, a T flip-flop and OR gate to accomplish this but I am not sure if it works and this requires quite many components as well.

 

[-LightOn-]

I tested using a T flip-flop with a simulator and with a appropriate capacitor it is possible to tweak the flip-flop so that it toggles its output between hi and lo everytime supply voltage drops down (the clickie function) so that it is possible to choose between 50% and 100% duty-cycle.