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After reading some of what's on the net, a few points were recalled, light from bulbs or tubes isn't coherent lite as with a laser. As it moves away from it's soarce, the beam widens and must cover more area unlike a laser beam which remains together over a longer distance and concentrates its' light only on a small area. You can compare it to water from a hose. tighten the stream, and it remains very dense and concentrated, open up the nozzle for a fine spray and the stream becomes much less dense while covering a much wider area. Actually, even light from a laser, traveling thru a fiber optic cable must be regenerated every few miles to maintain its' level or intensity. Sound, which really comes from the same spectrum as light, just at the opposite end, must also be regenerated, but more often. The only variable here seems to be the color of the light in the comparison. Incondesant lite is really yellow or a very off white and probably doesn't maintain its' intensity as long or over a given distance. White, on the other hand, even at low power ratings, is very intence at the soarce, and therefore will maintain a higher level of that intensity over the long haul.
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