Solar day lamps (SDL) are simple and cost-effective. A few examples of SDLs have been described in [1], [2] and [3]. An SDL without any energy storage element suffers from frequent changes in the ...

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A solar day lamp is a simple, inexpensive device for bringing “daylight” to dark interior spaces whenever the sun is shining. This article provides complete instructions for designing lamps using both ...

This series has been, for me, an exhilarating journey through two million years of human endeavour, passion and ingenuity. We began in East Africa with a chopping tool - a roughly shaped stone that ...

When you think about harnessing the power of solar energy for your home, the cost point of solar panels may be intimidating. But, what about a low-cost way to use solar power? With solar powered ...

If you fancy changing your desk lamp into a green one, then check out the Sunnan Solar Powered LED Desk Lamp from Ikea. The Sunnan Solar Powered LED Desk Lamp provides four hours of light on a full ...