Lamp, LED And Laser Light Source For Projectors

Metallic Halide And Mercury Vapor Lamp - The Oldest Light Source

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The High-Intensity Discharge (HID) lamp is the oldest of the light sources used in projectors. Invented in the s, the HID lamp uses rare earth metal salts combined with mercury vapor to produce light.

One advantage of the lamp source is the high brightness it provides. However, it has a high cost of operation as it's very power-consuming when generating its high brightness. Meanwhile, it contains mercury, which is not environmentally friendly and needs extreme caution when disposing.

In the s, the lamp got a makeover with the introduction of the ultra-high performance (UHP) lamp. The UHP lamp offered a much higher efficiency as compared to the earlier lamp. However, the effective brightness of the UHP lamp degrades from the first day it's used, and it will become darker over time.

Overall, the pros and cons of both HID lamps and UHP lamps are:

Pros:

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• They cost less when compared to LED or laser light sources in projectors.

• They provide good light quality.

• They provide high brightness.

Cons:

• As both lamps generate great heat and need space for cooling, the projectors are usually larger than LED or laser models.

• They have a short lifespan of about 3,000 hours and need to be replaced much sooner than the other types.

• They contain mercury in their bulbs and thus need extra caution when using and disposing of.

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