Is Energy and Power same for changing the value of light?

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Changing the value of the light, it does not show me as energy as it shows in the video, it says power…is it alright?

Yes, that appears to be a new feature in Blender 2.80 since it’s gone gold. The lighting attempts to be physically correct and will scale with your scene dimensions.
e.g:
image
When setting Length-base to Centimeters and Unit scaling to 0.01, the standard point light which was 1000W will now become a 100mW source. So, to maintain a consistent lighting across scene scales it seems the developers chose wattage as a standard instead of a unit-less “Energy” value.
image
So here you can see what in the default setup would have been a 1000W flood-light illuminating massive 2m² cubes, it is now a small 100mW LED-light lighting up two tiny 2cm² cubes.
Sun lights behave differently and cannot scale. They have a “Strength” value instead.

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