BB's Light Meter - the white dots will tell you the relative intensity of your light, the inner circle is for diffuse and the outer ring for specular. If the light intensity is too low the dots will disappear completely; as the intensity of the light is raised they get bigger until they disappear and white is replaced with reds and yellows. Quickest test is just to put the Light Meter in an empty scene, add a direct light and play with its intensity to see how the prop reacts.

Very simple and I find it invaluable.

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