Power consumption of APA102c LED 10mm grid
To avoid overheating and reduce the maximum potential current draw, we
  recommend that you set the APA102C 5-bit brightness setting to a value
  of 12(out of 31) or lower.


Okay 16 is the required limit to be set but is it possible to set to 12 and get a feedback? Why is the complusion to stick to 16?


  If the software you are using does not support changing the 5-bit
  brightness setting, then we recommend limiting the red, green, and
  blue color values for each pixel to 99 (out of 255) or lower.


It will not be pure white for sure but it is the price paid for the gain of power savings.


  If you don’t want to use a reduced brightness level, you can take
  other measures to reduce the power drawn by the LED panel. For
  example, limiting the number of LEDs that are on at the same time,
  limiting how long the LEDs are on, and lowering the color values of
  the LEDs can all help reduce the power drawn and keep the panel from
  overheating.


Last resort. 

I would recommend to try all three, see the tradeoffs: 
Ex.: trying brightness level of 14, limiting RGB value to 127 and so on. Also provide good heat sink. Providing good heatsink will limit the temperature rise of the LEDs thereby limiting drop in their forward voltages, which in turn limits the increase in current.