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A solar light that dies at dusk is not a mystery. The panel and the battery were sized for a July sky that will not come back for another eight months, and your November sky never got a vote.We build these lights and I have watched this failure happen to a hundred of them. The problem is not the LED. It is three numbers on the label that do not add..

A "500-hour" LED candle is one of those numbers that sounds like a spec and turns out to be a mood. In production we test every candle we ship, and almost none of them survive 500 hours the way the box promises. The gap between the label and the table is the battery, the brightness, and the mode. Here is where the hours actually go, with the number..

Every battery light box in the country promises 8 hours. None of them say it will survive -3C. I have installed hundreds of holiday runs over the last decade — patio, eaves, tree line, front step — and I can tell you the truth nobody prints on the retail carton. The runtime number is a warm-lab number. It is not the number you are going to get on C..

Here's the number you keep seeing on the box: 8 hours of light. You read it like a promise. Then you run the string for the first evening in the cold, and by hour five it's a half-dead, dim, flickering thing that you'd mistake for a broken one. Nobody warned you. The box didn't. The box just printed a number that is true exactly once - on a lab ben..