Dr Peter Hauk

PrtnctPAL Scientist

Making Meaningful Performance Measurements Dr. Peter Hauk is not just a principal scientist, he's a principled scientist—with 40+ years of experience. When he tests SureFire illumination tools for outputs and runtimes, his results are not misrepresented or exaggerated like those of many flashlight manufacturers. But Dr. Hauk tries not to get too hung up on numbers. "It's important I figure out experiments that produce insight into a product, problem, or both," he explains. "Not just numbers for numbers' sake."

"Take a bag of sugar and dump it on your kitchen table," says Dr. Hauk when explaining the difference between lumens and candlepower. "The highest point in the sugar pile, that one solitary grain of sugar at the top, is equivalent to candlepower. The total amount of sugar on the table is equivalent to lumens. Now, you tell me which seems to be a more useful measurement when talking about light."

how much usable light is being emitted. A lumen measurement, on the other hand, is a photometric quantity determined by measuring the total radiant power (watts) across the light's spectrum and then correcting the data for the relative response of the human eye—a complicated-sounding but much more useful measurement.

Candlepower vs. Lumens

Some manufacturers dramatize the outputs of their lights by using candlepower units, which are often grossly inflated. A "candlepower" measurement typically refers to the single brightest spot of a beam, which tells nothing about the quality of the beam or

reFire Customer Wilkey W Midnight Shoveler

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