74HC595 driving 12V RGB ledstrips

I measured with all RGB ports set to 255 without fading and
I get 47.5mA for one RGB strip.

The strip is rated at 1.2A when 1 meter (100cm) is lighted but im using just 5cm. So
converting the current would assume:

1200mA/100cm = 12mA -> 1cm = 12mA -> 5cm = 60mA