Over 20 Years Servicing Projectors for Education, Business, Houses of Worship.


Over 20 Years Servicing Projectors for Education, Business, Houses of Worship.


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Frequently Asked Questions about Projector Lamps (FAQ)

What are Cobalt Lamps?

Cobalt is the Projector Doctor brand name for high quality replacement projector lamps that are up to 65% less expensive than OEM projector lamps.  We guarantee that all Cobalt Projector Lamps are made with 100% OEM bulbs and reflectors/burners from manufacturers such as Philips, Osram, and Ushio.  You can always expect to get a bright, quality image and a product that lasts the test of time.

  • 200-day warranty
  • All top brands and models
  • Free ground shipping (in continental 48 states)
  • Original bulbs
  • Price match of same quality
  • High-quality guarantee

What are OEM Projector Lamps?

OEM projector lamps are high quality projector lamps that come directly from the projector manufacturer.  These lamps are often dramatically more expensive than replacement lamps.  Important to note that OEM lamps often contain the same high quality bulbs from Osram, Ushio, Philips and Phoenix that are found in Projector Doctor’s Cobalt brand lamps.  So why pay the higher price for an OEM lamp when you get the same technology at a lower cost from Projector Doctor?

Why are lamps on some websites so much cheaper?

These generic projector lamps are built using the substandard components and build techniques that result in a dimmer and shorter life for the lamp.  These low quality lamps can damage the projector itself causing safety concerns and voiding your projector’s warranty.   The pricing on these lamps can be very attractive, but you will get what you pay for.  Buyer beware.

Why is my projector image so dim?

It may be time to replace your projector lamp or repair your projector. Projector lamps will dim down to approximately half of their original brightness as they get older. Check the number of hours of lamp use in your projector’s menu system to verify or see your user guide for more details.  If you have further questions, then please reach out to us: https://projectordoctor.com/contact-us/

How many hours should I get from my projector lamp?

Projector bulbs have an expected usage time, called lamp life. Lamp life is expressed in hours and represents the number of hours before the lamp is at half its original brightness.

Your expected life of a lamp will vary based on the lamp technology and the projector; however, most projectors offer appoximately 2000 hours. Like a light bulb in your home, some lamps may fail sooner and this is part of the acceptable operating range of the rating.

For projectors that are used under normal operating conditions (i.e. no more than 3-5 hours per day in a clean, relatively dust-free environment) the lamp has the greatest opportunity to last its entire rated lamp life.

How can I maximize the life of my projector lamp?

There are numerous things you can do:

  • Do not overheat your projector.  Be sure there is proper clearance near air vents.
  • Do not run your projector in a dirty, dusty environment.  Dust gets into the fan, clogs the filter and heats up your projector.
  • Replace your air filters every 3 months.  If you room is dusty, then replace more frequently.
  • Avoid turning your lamp on and off excessively as it will wear down the lighting technology. 
  • Use surge protector technology to prevent shocks to the projector.
  • Put your projector into Lamp Economy Mode (if available).  This will reduce brightness approx 20% (hardly noticeable) while maximizing the life of your lamp approx 50%.
  • When you are finished using the projector and the lamp has cooled, power it down normally and completely before removing the power cord or unplugging the unit.

How do I replace my projector lamp?

  1. Let your lamp cool down.  Unplugging the power cord from your projector will let your lamp cool down safely.
  2. Open the lamp access panel by removing the necessary screws.
  3. Unscrew the housing from the projector.
  4. Reach in and firmly remove the lamp housing out of the projector.
  5. Carefully place the new lamp housing in the same orientation as your old lamp.
  6. Make sure your lamp is firmly plugged in with full contact.
  7. Replace the lamp mounting screws so your new lamp is secure.
  8. Replace the lamp access panel and tighten the screws.
  9. Plug in your projector and turn on the power.
  10. Reset the lamp counter so you can track hours of usage with the new lamp. Some lamps will reset the lamp counter automatically while others will not. If your projector needs the lamp counter manually reset, then consult your projector menu for the option to reset to zero hours.