Now, after read my 6 thread tip, no solution clearly given, so I go ahead to my problem.
When I power on my 4 LEDs gave fast full flash brightness for 3-4 seconds. That's a sign that all LEDs are ok. After this the pattern starting it goes to approx. 20 % brightness. In the product description, this CC DRIVER LED was a dedicated PWM using with Arduino. As diagram view, I'm using 2 parts of Li-Ion battery 18650/3400 mAh as power source, step up converter prevent 12-14 volt. I was also try switch mode power supplies, 12 V 30A. This changed the brightness to approx. 30 %.
To find out where this current as 40 mA from Arduino output goes Is measured the output pin voltage. My multi meters has 3.9mV as "noise" voltage when not connected . I can see I measured peak voltage from Arduino PWM output to 200mV! Normal this pulse as high/ON are 5V max load 400 mA. As I understand this PWM unit dedicated for use together with Arduino, which makes no sense to me what are wrong to my diagram. It sounds like this PWM give Nano output goes overload?
Go to this URL and find all device parts eg. other info in the Word-doc. https://onedrive.live.com/redir?resid=DD2C186E5334F02C!368166&authkey=!AHIQO10jd5sa-xk&ithint=file%2cdocx
Appreciated volunteers with help and tips!