After thinking i cant open the LED without breaking it i have it open now.
The 3 LEDs are series-connected.
The electronic was sealed in some silicon.
Looks close to this ones: http://detail.china.alibaba.com/pic/914205741.html
Its a MT7201 1A LED driver: http://www.maxictech.com/en/UploadFiles/MT7201_rev1.1_EN.pdf
And the circuit is close to this one: getaktete LED-Treiber
But there are some diodes in front of it as rectifier.
Looks like you can PWM control this driver.
I will try to reverse engineer the circuit/PCB to find out what the LEDs need.
If i build my own driver, is it better to
- put the MOSFET and driver near the LED
- put the MOSFET near the Arduino and the driver near the LED
- put the MOSFET and the driver near to the Arduino
And sure there are dimable LEDs out there, but they are not cheap and this have a really
good Colour Rendering Index and Color temperature.