so, I bought these LED ceiling lights, expecting them to be IR controlled. Turns out they use a 2.4GHz controller, which will be pretty hard to spoof. I’d still like some way to control them, though.
I opened them up to look at the insides. It is a 36v/47W LED board with a CCT controller. I am wondering if I could simply replace the controller with a Zigbee LED controller like these here:
Your original driver is constant current driver, providing 1300 mA.
The driver you found provides only 900mA.
IMO it will not light up.
In similar case I used 2 mosfets driven by constant voltage led driver (shelly rgbw2). I pulled current from original driver through those mosfets.
Done.
the second one provides 4x5A.
You need driver which provides exactly the same current. This is the point of constant current power supplies.
Here is how I did that with Shelly RGBW2. This shelly has another great feature: it has to be mounted in lamp because of number of connections with led, but light on/off can be still controlled from input switch powered with 230V (toggle or momentary, the latter is preferred due to some additional control features)
MOSFETs any n-type being able to handle gate voltage and drain current (12V and 600mA respectively in my case).
To powerup the shelly, you need something between 12 and 24V constant voltage. You also have to deliver max power to LEDs. I opened original driver finding the point before the voltage is modulated for leds. It will be PWM modulated by Shelly module. This might be the trickiest part of the project.
I used LM2596HVS step down converter to achieve needed voltage for Shelly. Watch out output voltage of constant current power supply even if no load connected. Buck converter must handle it! LM2596S handles up to 40V. I though it’s enough but it didn’t.
