Greetings from the DesignBUILD 2009 exhibition which features "Green Building" section at the Sydney Convention & Exhibition Centre in Sydney until 23 May 2009. One product which got my attention was a low cost solar power system from Soanar for $899 (show special). This has a 80 Watt solar panel, controller, 600 Watt 230 Volt inverter and 100 AH sealed lead acid battery. This is enough for a small independent power source for a holiday home or perhaps a one room school.
One issue which such small solar systems bring into focus is the amount of power used. Soanar were also selling low power LED replacements for halogen downlights and LED strips to replace fluorescent strips. However, if you replace halogen and fluorescent lights with LEDs of equal brightness the cost will be high. In many cases there is more light provided than really needed. Frank Harrington from Soanar said they will custom design lighting layouts for industrial and business use. I suggested a 1 Watt down light would be useful where too many down light have been installed (and a dimmer is used). The 1 Watt LEDs are much cheaper and do not require a large heat sink.
Another application where less light is needed is in libraries converting space to learning commons, such as the one University of Canberra Library are building. Libraries need brightly lit areas for reading and particularly university libraries where blurry archival documents may be used. However, a learning commons will mostly use computers. In this environment the general lighting can be much lower and task lighting used. This can save 75% of the energy used in lighting (and as much again in air conditioning power used to take away heat from the lights).