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My Pearl had 571 hours on the original bulb, and I decided it was time to get a new bulb, and keep the old one as a spare. I did not do this because I had any complaints about the image brightness (it was fine), but just so I would have a spare bulb.
Thanks to this great thread on measuring your projector brightness:
http://www.avsforum.com/avs-vb/showthread.php?t=755705
I decided to get the CA813 light meter - below are the measurements of both the old and new bulbs. Measured image size is 50.5 high (16x9 image = 31.49 sqft) with a throw of 17 feet. Pearl set to low color temp. The Panel +20% refers to the panel driver settings in the service menu. The FTL numbers are for a unity gain screen (1.0). Note also that the "contrast" slider in the Pearl menu is set to 80 for these measurements. Note that this is NOT the maximum lumens the Pearl will generate for three reasons - contrast not set to 100 in pearl menu, not at shortest throw, and not in high color temp.
Code:
Thanks to this great thread on measuring your projector brightness:
http://www.avsforum.com/avs-vb/showthread.php?t=755705
I decided to get the CA813 light meter - below are the measurements of both the old and new bulbs. Measured image size is 50.5 high (16x9 image = 31.49 sqft) with a throw of 17 feet. Pearl set to low color temp. The Panel +20% refers to the panel driver settings in the service menu. The FTL numbers are for a unity gain screen (1.0). Note also that the "contrast" slider in the Pearl menu is set to 80 for these measurements. Note that this is NOT the maximum lumens the Pearl will generate for three reasons - contrast not set to 100 in pearl menu, not at shortest throw, and not in high color temp.
Code:
Code:
Old bulb - 571 hours: Lumens FTL
Panel normal - Low 187.30 5.95
Panel normal - High 263.39 8.36
Panel +20% - low 215.10 6.83
Panel +20% - High 292.66 9.29
New Bulb - 1 hour: Lumens FTL
Panel normal - Low 380.46 12.08
Panel normal - High 585.32 18.59
Panel +20% - low 441.91 14.03
Panel +20% - High 661.41 21.00
New Bulb - 50 hours: Lumens FTL
Panel normal - Low 324.85 10.32
Panel normal - High 491.67 15.61
Panel +20% - low 386.31 12.27
Panel +20% - High 570.68 18.12
New Bulb - 100 hours: Lumens FTL
Panel normal - Low 321.92 10.22
Panel normal - High 488.74 15.52
Panel +20% - low 374.60 11.90
Panel +20% - High 561.90 17.84