................................................................................................................................................ ii

all the distributing electric light stations, it has not yet been found practicable to make a lamp which will stand the strain. Hence we have to be content with somewhat indifferent carbon filament lamps. Before the war many operation lamps such as Jessop's were fitted with a Nernst filament; as this is no longer obtainable the lamp is rendered useless. A very excellent substitute for the Nerns...

This paper discusses the design and implementation of single phase PWM inverter using 8051 microcontroller. The main features of 8051 based PWM inverter are simpler design, low cost, maximum range of voltage control and compact in size. The designed PWM inverter is tested on various AC loads like AC motor and intensity control of incandescent lamp in a closed loop environment.

A reduced spatial and temporal coherence light from a halogen lamp is used to copy holographic optical elements, and a maximum diffraction efficiency of 80% is achieved.

All artificial lighting devices undergo some color shift over the course of their useful lifetime. Unlike incandescent and halogen lamps, which display a gradual shift along the Plankian locus, energy-efficient lamps degrade Color-Correlated Temperature (CCT), in a non-blackbody manner. This exacerbates a generally poor appearance, and can impede public acceptance, especially among residential ...