I have the Blinkt! Module for my Raspberry Pi (https://shop.pimoroni.com/products/blinkt) which from what I can tell features 8 APA102C LEDs (Datasheet: https://cpldcpu.files.wordpress.com/2014/08/apa-102c-super-led-specifications-2014-en.pdf)
I realised that even when all LEDs are turned off, the module gets to a temperature of around 30°C when connected to the Raspberry Pi 5V line. The powermeter connected to my Raspberry Pi power unit shows an increase of power consumption by 0.4W when the turned of LED strip is connected to the Pi. When I measured the LED strip current with a multimeter, it was something like 42 mA when off and a maximum of 210 mA when all 8 LEDs are turned on with the color white at maximum brightness. The voltage of the 5V line on the Raspberry Pi was 5.351V last time I measured.
Is this much energy consumption normal for APA102 LEDs that are turned off and should I be concerned that this could damage them overtime, when there is a constant current running through them that raises their "off" temperature to 30°C?