Various types of led strip power

How to calculate the led strip power? The datasheet of led strip provides a theoretical answer to this question. And we know from over here. the 1 meter ( 3ft) led strip power is 14.4W. How to compute the result . the calculate formula as follows:
The power of echo pcs SMD5050 led module is 0.24 watt. and there are have 60 LEDs on 1 meter(3ft). 0.24Watt *60LEDs =14.4Watt/meter(3ft)。we just need to know individual led power and led quantity (1meter or 3 ft). then we can calculate the total power. Next topic: different bind led module has different parameter(LED power). Now for a quick look at some of the other module power.
LED package         Power

SMD3528              0.08W

SMD5050             0.24W

SMD2835             0.1W

SMD3014             0.1W

SMD4014             0.225W

As mentioned above, The parameter of led power from datasheet, it was just theory . in fact, we can’t use the full power to run led strip. In other words we will be limited to be less than this value. We use only the 12watt about when the theory value is 14.4watt. the experience from led detect device. We call it actual measurement .

Actual measurement power = theory power * 80%