None.
Watts is unit of power.
Square meter is unit of area.
That's not a special kind of light - you can do that with any light. The power per area (e.g., watts per square meter is a measure of INTENSITY.
Watts is a unit of power (energy per time). Square meter is a unit of area (length squared). These units are not convertible between each other.
If the appliance tells you how many watts it's supposed to use you can buy a watt-meter to measure how many watts the appliance is using buy plugging in the meter into the wall and then plugging the appliance into the meter. A popular brand is "Kill A Watt", it meter can be bought on E-bay for under $25.
1 hectare = 107639.104 sq. feet
one hundred squar feets
Assuming that "squar" was meant to be square and "acer" was meant to be acre, the answer is 43560 sq feet.
A small one 100 watts, a large one 1000 watts or more.
for a large one it is 4,000 watts and for a smaller one it is 1,000 watts
There are one million (1,000,000) watts in a megawatt.
One kilowatt is 1000 Watts.
One lumen is equivalent to approximately 0.001496 watts.
0.001 or .001 or 1/1,000th or one one thousandth or a thousandth. A megawatt is 1,000,000 watts or one million watts. A kilowatt is 1,000 watts or one thousand watts.