The Tri-L: A Portable LED Work Light

Altus Lumen Portable LED Work Light

I’ve been testing the battery-powered Tri-L LED work light by Altus Lumen. I have to admit that this light has become one of my favorite gadgets. The design of the Tri-L shows great attention to detail. The metal housing is made out of 85% recycled magnesium which is lighter than aluminum, so the Tri-L feels […]

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Hyperefficient Transportation: Utility Bikes and Bike Trailers

Utility bikes or “work bikes” are very efficient vehicles for transporting cargo (and children too). They are quite popular in bike-friendly places like Amsterdam, Copenhagen and China. Bikes can tow a remarkable amount of weight. Loads in excess of 880 pounds (400 kilograms) have been hauled behind bikes along flat surfaces. Generally though, 300 pounds […]

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La Mancha Experiments With Solar Concentrators

The land of La Mancha, made famous by Quixote and his windmills, is a sun-drenched, windy part of Spain. Fittingly, the region is a veritable experimental hot-house for solar concentrator installations. Many start-up companies are at work devising techniques of focusing light on a solar cell, in order to reduce the amount of silicon or […]

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The Solar House: Free Heating

People often think of using solar energy for producing electricity, but it is actually easier to harness the power of the sun to heat your home. It’s free heat that has been utilized since ancient times but few modern architects or builders really understand the principles involved. The Solar House, by Dan Chiras, explains architectural […]

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Solar Evacuated Tubes: Free Hot Water

For solar water heating in your home, there are basically two types of solar collectors: conventional flat-plate collectors and evacuated tube collectors. Evacuated tubes have a number of advantages: the work on overcast days, in colder weather, and the tubes can be installed and replaced individually without special tools.

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