In the beginning of the projector lamp creation the first producers used as source of power mercury gas packed at high pressure in order to achieve the right level of brightness called ANSI LUMENS. This was considered over the years a very dangerous and hazardous source of energy and was eliminated.

The nowadays projector lamps function on different principles. The light of the lamp is broken in a color prism containing red, green and blue, the three major components of the video signal. These lamps work with polarized light that goes through an LCD panel. The pixels resulted are can be opened or closed blocking the light or allowing it to pass. The three resulted images are then combined in a mirror system and projected on the main lens.

These types of projector lamp technology use haloids and are part from the family of the lamps with gas unloading (born from the ancient lamps using mercury vapors). This technology is used because of its possibility of controlling the temperature of color in the resulted light due to the possibility of manipulating the right combination in the gases from the interior. This is a very efficient technology because 24% of the energy is used to produce light which is a lot more productive that in the case of florescent and incandescent light bulbs.

Due to the high temperature of the lamps functioning is mandatory for the projector lamps technology to have a cooling system. Depending on the interior design and the dimensions of the lamp this system can be more or less noisy.

Another technology for the projector lams is the digital light processing. Instead of pixels this technology is based on microscopic mirrors. Each mirror is mounted on a special support which allows it to be inclined so that will reflect the light or redirect it to some place else.

When the mirror is set on ON position the light is reflected through the lens system which is used for its projection. When the mirror is set for Off position the light is focused of a photo absorbent surface.

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