Originally Posted by blake
I am not following. How does a calibrated NX9 at 1900 lumens drop to 1500 lumens ? Even running in high lamp the bulb will not dim that much for a few thousand hours....
Oh yes it will , with exception to a few unicorns , the vast majority lose anywhere from 15-20% within 500 hours. Unless lamp manufacturers have changed something significantly in the last year, expect the biggest losses up to 1000 hours. After a lamp looses the initial brightness, say after 500 hours , then the curve flattens, drops slowly to half brightness around 5000 hours .
So if you start at 1900lumens, drop to 1500 hours that represents a near exact 20% drop, I'd say it's both typical and right on track when running high lamp . So while everyone may have slight variances to this , truth is the majority are in this range. What is well known is this : the lamp degrades most in the first 500 hours, using high lamp setting speeds up the process and high on off cycles also contribute to a shorter life . Since most are actually using their projector for the largest screen possible, to achieve the best for HDR and 3D they run in high mode nearly all the time .
I ran my VW675 and RS600, mostly on high, for 500 hours side by side a/b testing, both lost 15% before 200 hours after that it started to flatten out, by 500 hours I was down 20% , I'd say nearly 25% around 1000 hours. This is well documented in forums around the globe . I changed my lamps around 600 hours, for my needs this was every two years, it was the only way to keep a decent amount of lumens for a larger screen . If you want stable light that does not degrade quickly a laser is the only option otherwise you just keep changing lamps or even better, use a screen size appropriate for the 80% lumens range where the lamp has degraded, you'll get by for a few years easily .
A 2000 lumen lamp and 2000 lumen laser are different beasts even from the get go right out of the box. The laser will appear brighter , especially in color saturation and pop. There is nothing wrong with a lamp based projector at all, problem is they all degrade, we really need to consider brightness and screen choices based on the 80% range . Marketing tells us it's ok to consider the projector at new values and that is where the consumer is misled . I personally compensated with smaller screen, increased gain and the addition of a anamorphic lens, I still had to change lamps around 600 hours otherwise the image was just unacceptable . A laser light engine solves this issue, mitigates the often need calibrations too, a double bonus.