to the United States 
An LED module’s wattage (power consumption) can be easily calculated using Ohms Law.
P = (V x I) x n
Where
- P = power in watts (W) consumed by the LED
- V = Forward Voltage rating of the LED (Vf) in volts (V)
- I = current used to drive LED in amperes (A)
- n = total number of series-connected LEDs
For example, the SW-13-W5 has 3 series-connected LXML-PWC2 LEDs mounted to the module. The typical Forward Voltage is 2.9 V. Assuming you are powering the module at 700 mA (0.7 A), the power consumption for the LED module will be 6 watts:
(2.9 x 0.7) x 3 = 6 W
Note that unlike traditional incandescent lighting, which typically equates light output to wattage, the wattage of an LED is only an expression of its power consumption, not its light output. Light output for LEDs is always expressed in lumens, not watts.
