lighting powerdensity （LPD）

We’ve always ( often) find parameters (W/m2) on light Engineering cost calculation. what’s function of parameters ?how to using the parameters?

Starting with the concepts, lighting powerdensity （LPD）—The luminous intensity on unit area. This unit is per square watt （W/m2）.As the name suggests, total power of led divided by the total area of the room. then share of the result to per square
For more discussion of the topic of lighting powerdensity （LPD）.please see table as follows:
irradiation intensity（LM) and lighting powerdensity（W/m2）

LM(LX)	lighting powerdensity（W/M²)
450LX-500LX	13W/M²-15W/M²
350LX	12W/M²
250LX	9W/M²
200LX	8W/M²
100LX	5W/M²
75LX	4W/M²
	Height 6M=36LM/W/M²
	Height 3M=50LM/W/M²