Portable, Motion-Detecting LED Lights

by Justin Thomas •

Portable, motion-detecting LED lights are an efficient way to light rooms at night for a few minutes. This portable light from Maxxima, turns on when you enter a room in the dark (similar to motion-detecting outdoor lights), then turns off after 30 seconds of non-motion. It runs on four AA batteries (we suggest using NIMH rechargeables), and should last about …


LED Grow Lights

by Justin Thomas •

A lot of readers expressed interest in using red and blue LEDs for hydroponic growing. These LED lights can be found at Amazon. It is, of course, more efficient to grow plants outside, but when this is not possible, LEDs are an efficient choice.


Red LEDs to Grow Lettuce

by Justin Thomas •

Apparently red LEDs are 60% more efficient than fluorescent light when growing vegetables hydroponically. According to IEEE Spectrum Online: Of all the colors of the rainbow, red is lettuce’s favorite. Chlorophyll, the electrochemical engine of photosynthesis, runs on red photons. So if you are growing the vegetable indoors in a factory, why waste energy on colors you don’t need?


LED Floodlights

by Justin Thomas •

Enlux, a company in Arizona, has created floodlights built from LEDs. They did this by removing the diodes from their individual plastic housings and clustering them on a heat-dissipating circuit board, known as a light engine. They also created finned aluminum housing that spreads the heat across its surface. The 22-watt floodlight ($80) gives off about as much brightness as …

Indestructible Touch Sensitive LEDs

by Justin Thomas •

These “Indium” lights use lithium-ion battery technology with high-intensity LEDs to produce a powerful light in a very small package. The Indium is controlled by a touch sensitive switch and has no moving parts. The casing is machined from solid aluminium bar stock on computer controlled machines, and is virtually indestructible


LED Ceiling Lights

by Justin Thomas •

Glen Hunter has created lighting fixtures using 1 watt LEDs and acrylic rods. He originally designed the lights to use in his off-grid house. This kind of lighting design is really pushing the efficiency envelope. They are now available from Eurolite. More information: GlenHunter.Ca

3D LED Reactual Sculptures by James Clar

by Justin Thomas •

< James Clar makes 3D sculptures out of LEDs. They can function as a 3D spectrum analyzer or act as a primitive camera. Clar says "Each LED acts as one pixel in the spatial array and can be refreshed at a rate of over 60 frames per second creating a low resolution 3D television." We also like the back-lit wall ...


LEDs (Light Emitting Diodes)

by Justin Thomas •

In recent years, significant advances have been made in the manufacturing of LED bulbs. Once used only as power indicators on appliances, LEDs can now be used to light a room or in powerful flashlights. Some of the advantages of LEDs are: LEDs use about 1/50 of the power of standard incandescent bulbs, and half the power of compact fluorescents …