The V and H angles are explained graphically here:

And here is an example:

In the icon top left the flat side of the hemisphere is the one which emits light.

The diagram above will be easier to understand if you also look at this annotated photometric solid:

Just to explain a bit more, imagine this luminaire is at the end of a playing field, above the goal, and imagine it is pointing into the center of the field:

As the V angle
increases you are pointing further and further away from the goal, and
closer to the center of the field. You could imagine that

- V=-70° points directly at the goal
- V=0 points at the center of the field
- V=+70° points at the opposite goal.

(In
practice of course it is rare to have a floodlight above the goal, but
it helps us to imagine what V and H mean.)

And here is one more graphical explanation of VH diagrams

And here is one more graphical explanation of VH diagrams

(For an explanation of what intensity, luminance, and illuminance means, this book...

...will help you)

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