About a year ago, engineering consultant Mike Wood was trying to measure the output of a tri-chromatic LED luminaire. Its pure blue output looked bright to his eyes, but his top-of-the-line photometer showed very little output. To make the matter more confusing, his least expensive light meter gave a reading that was closer to what he was seeing. What was going on? The problem is that the standard CIE photopic luminous efficiency function, originally established in 1924 and slightly revised ...

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