Saving energy by making useof eyes' sensibility to contrast
By Professor Hugo D Godoy Azar
(extract)
"...I invite you to try an exercise of observation that clearly illustrates our idea:At night, proceed to a wide straight avenue, if possible 500-metres long, with traffic lights working at the end. You will see that despite the distance, you will be able to see clearly the lamps of the traffic lights, which have a minimum of between 75 and 150 watts. Wait until a car arrives and stops at the lights. You will be able to see clearly its rear lights – of 5 watts! Intriguing, isn’t it?..." [more]