In the human eye the perceived brightness of illumination depends of color. It takes more energy in the blue or red portion of the color spectrum to create the same sensation of brightness as in the yellow-green region.

When it comes to sensing light in the human eye there are two main light-sensing cells called rods and cones. If one took a tube and looked straight ahead through it so that it allowed the field of view to be restricted 2 degrees, light photons would fall on the part of the eye called the fovea that consists mainly of cones. The peripheral area surrounding the fovea consists of both rods and cones with the rods outnumbering the cones about 10:1.

The Use of Templates in The Lighting Design Process

What is a "boiler plate" and how does the use of a "template" aid and assist a Lighting Designer or Electrical Engineer in producing a valid spec, job by job, and do it effectively to meet the Construction Document time line?

As a Lighting Specification Engineer for GE responsible for driving GE branded specifications in my territory, I often ask the Engineer and Designer "...who is listed in your spec? Which format are you using? How often do you update it?" Many times, the answer is one wrapped in an aura of amazement that I would even raise the question. But invariably, the discussion centers around the wonderment as to whether the spec is even current and second, whether the template really includes valid spec language reflecting new technologies and up to date codes and legislation in effect for the region. Most responses go like this: "...you know, I don't even know the last time we updated the spec. Let me see if I can find it."

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