Enertia builds houses with solid, engineered wall segments in place of siding, framing and insulation. The houses are designed so that an envelope of air runs around the building, just inside the walls, creating a miniature biosphere. Solid wood buildings, common in Europe and Scandinavia, are not seen much in America, except for log homes.
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