A newly developed lighting source: Super bright Whit LED
only consume 10% power of bulb or 50% power of fluorescent tube.
Commercial product are now available in this field. However they were too
simple and expensive. A simple head-light just constructed by a current
limit resistor and 3 white LED cost more than HK$300.
As a result, I am investigating the possibility to
develop a high performance flash light.
