At the present more people do use ampoule or bulb at home. Also an ampoule a led or LED lamps are used for both general lighting and special purpose lighting. Where colored light is required, LEDs come in multiple colors, which are produced without the need for filters. This improves the energy efficiency over a white light source that generates all colors of light then discards some of the visible energy in a filter.
The simulateur d’aube or Dawn simulation is a technique originally developed to help treat Seasonal Affective Disorder, but can be used as a soundless alarm clock to wake up the body naturally. Typically, the treatment involves timing lights in the bedroom to come on gradually, over a period of 30 minutes to 2 hours, before awakening. According to expert the concept of Dawn simulation was first patented in 1937 as Artificial Sunrise, “a brightening device to assist awakening.” Modern electronic units were patented in 1973 and variations have been patented every few years since 1929.Clinical trials were conducted in the 1980s at Columbia University following a long line of basic laboratory research that showed animals’ circadian rhythms to be exquisitely sensitive to the dim, gradually rising dawn signal at the end of the night.