Can anyone address this topic. The proper way to dim LED's is to use PWM? Right?
So how does this work with pre-made off-the-shelf LED constant-current power supplies like you see on ebay?
Can you create a simple little FET high-power switch and drive it with PWM from wherever (555, Arduino, Teensy, or other embedded) and use those constant current supplies, or would that high-frequency load drive those power supplies crazy and just not work?
OK so the context is I want to use a bunch of 10Watt LED's for under-cabinet lighting in my kitchen. On heat-sinks, of course. But have a small arduino control dimming.. so that you come in to the kitchen and turn it on to whatever brightness is desired. it turns on one or more constant current supplies to some number of LED's in saeries. If you leave the room for a some period of time you have a small PIR also on the arduino that switches to a much dimmer PWM (to save energy AND LED life). If motion is detected, LED's go back to the initial level.
OK coding all this up is no problem... But findiing the right power supply (AKA, driver) and switching circuit (or I could make my own). is the challenge. Biggest question is what effect PWM would have on these modules (like THIS or THIS or THIS)
Thanks
So how does this work with pre-made off-the-shelf LED constant-current power supplies like you see on ebay?
Can you create a simple little FET high-power switch and drive it with PWM from wherever (555, Arduino, Teensy, or other embedded) and use those constant current supplies, or would that high-frequency load drive those power supplies crazy and just not work?
OK so the context is I want to use a bunch of 10Watt LED's for under-cabinet lighting in my kitchen. On heat-sinks, of course. But have a small arduino control dimming.. so that you come in to the kitchen and turn it on to whatever brightness is desired. it turns on one or more constant current supplies to some number of LED's in saeries. If you leave the room for a some period of time you have a small PIR also on the arduino that switches to a much dimmer PWM (to save energy AND LED life). If motion is detected, LED's go back to the initial level.
OK coding all this up is no problem... But findiing the right power supply (AKA, driver) and switching circuit (or I could make my own). is the challenge. Biggest question is what effect PWM would have on these modules (like THIS or THIS or THIS)
Thanks