Why Do Bright Projectors Have Short Lamp Life?

Have you ever noticed that the projectors that offer the highest lumens, and therefore provide the brightest images, consistently have shorter lamp life? The simple answer is that since the higher wattage projector lamps produce so much heat, it is hard for them to keep their structure intact for as long.

Philips invented the UHP projector lamp way back in the 1990’s, and it was a lamp that could produce a brightness unlike any other without having to use too much wattage and maintain a decent life. The mercury vapor, once heated, completes the connection allowing for the projector lamp to light up. However, since there is so much pressure, the lamps get very hot and must have a sufficient cooling system and ventilation, preventing the breakdown of its components.

The higher wattage lamps of those projectors that have lumens of over 1000 ANSI, remain at higher temperatures for longer periods of time. Some manufacturers have developed better cooling systems for their projectors thereby somewhat overcoming the short lamp life. However, for the most part these high wattage projector lamps cannot sustain the temperatures for very long and you will notice lamp life to be between 1000-1500 hours.

Let’s take for example Sony’s VPL-CS3, a projector that has 700 ANSI and employs a 120W UHP projector lamp. The VPL-CS3 has a lamp life of about 2000 hours. When we compare this to another Sony, the VPL-PX11, the projector lamp used is a 200W UHP, which produces 2000 ANSI. Lamp life for the PX11 is only 1500 hours.

Of course, new technology has come into play for other projectors that use lower wattage lamps while still providing fantastic brightness. Sony has effectively magnified the power of a lower wattage lamp with its VPL-CS5, using a 165W lamp to output 1800 ANSI. This new information is seemingly turning the lamp life world on its head especially since lamp life for the CS5 is 2000 hours.

Manufacturers are figuring out ways to get a brighter image from a less powerful lamp, without overexerting the low wattage lamp to the point where it is wasting lamp life. It also comes down to the quality of the materials used in the lamp manufacturing process.

The glass or ceramic used for the reflectors and the arc tubes (bulbs) must be able to withstand the pressure and high temperatures. If you are considering buying a projector that is extra bright, also consider that you may have to replace your projector lamps more often, at least for the moment. We will continue this segment in further articles and provide updates