Plasmas are like 30+ fL OOTB most of the time (can be 50-100+ too), my projector in my setup is nowhere near that. It was 14 fL to 20 fL as it should be, this is not Plasma brightness. To maximize the Native on/off of a JVC, you must close the IRIS to -10 thru -15 or so, this is going to drop those lumens way way down. The numbers quoted in here are based on full IRIS OPEN numbers. Also, I have my projector at farthest throw to maximize contrast (not that it makes a huge difference), but this also further reduces brightness 20%+ or so. So we can take those default "closest throw" with IRIS at 0 and LAMP HIGH numbers and feed them to the birds.You have to realize all combined JVC issues:
1) Due to LAMP HISTORY and cost, most are much more comfortable running it in LAMP LOW (called normal in JVC menu), rather than LAMP high
2) The JVC lamps (on older models) tend to dim MUCH faster than others
3) To maximize the on/off JVC contrast, you need the IRIS at -10 or even -15 (this about cuts your lumens in half)
4) Many of us have PJ's mounted near farthest throw losing another 20% to 30% of brightness
5) Few of us actually get 2.0+ gain out of the HP screen (most own 2.4 gain screen), but due to mounting location we only get 1.5 to 1.6 gain.
When you factor in all the above reasons, a HP screen hardly seems OVERLY Bright. Many of us will only have 20% of the stated lumens to work with at first, and we open the IRIS up as the lamp ages. The way people are talking about the HP screen in here assumes 2.0 gain, lamp high, IRIS 0, closest throw, with NO DIMMING. Most of us in here don't even set our stuff up anything like that, why would we if we are going for the best image.
If the JVC lamps dim much slower than in the past, then it changes the game. The main thing is why even buy a JVC if you are going to use it at IRIS 0, mise well get a Sony or something.
1.5 gain does not even look nearly as much brighter than 1.1 gain as you think (yes it looks brighter). People claiming JVC's are too torchy with the HP screen apparently never thought this through
At 850 hours, my lamp is useless on a NON-HP screen at this point, and it is only 106". I will get about 8 fL calibrated lumens if I was lucky.