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For those who want to know what the Inverse Square Law of Light is . . . The intensity of light on a surface is proportional the one over the square of the distance from the surface to the source. Explanation . . . Picture a candle with the flame happily dancing and giving off light. The amount of light created at the candle is constant and is moving away from the candle in all directions at the speed of light. The amount of light is constant at any given distance away from the candle but the surface area grows as a square of that distance. So now picture a basketball around the candle. Add up all the light shining on the inside surface of the basketball and you have the amount of light given off by the candle. Now increase the size of the basketball by a factor of two (doubling the radius) and the surface area goes up by a factor of four. But the amount of light shining on the inside of this larger ball is still the same. However, the intensity of the light per square foot has dropped by a factor of four and this is what you perceive as brightness. This is what the inverse square law of light is all about. It is also true, I believe, for all other energy sources that radiate in all directions such as sound; however, heat will not obey this because heat wants to travel in a specific direction. I hope I didn't bore anyone with this and I hope you all enjoy your model railroading. - Ed
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