That would be a dim bulb I guess! No reflective measurement, just an incident reading. I didn't have a ton of time before I left for work so I'm not 100% sure if I had the meter setup correctly. I'm going to double check it tonight. It can take incident readings a number of different ways and I was in a hurry.
Then again, my bulb does have 2000 hours on it. :dontknow:
Yeah, it would be a good idea to take another reading making sure your meter is set up correctly (you almost have to take a course to learn how to use that thing! :laugh
. I'm not making fun of mech or his light meter; that thing is a seriously wicked meter!
So my calculation was correct in 4.6 X 29.6 = 136 lumens?
That's what I get assuming a 100" diagonal 16:9 screen. You are having 4.6 fL. of light hitting a square foot of screen, multiplying your screen footage by 4.6 gives you 136 total lumen/sq ft for the screen.
I played around with the Pro Calculator at PJ Central and your PJ in video mode is showing 14-16 fL for that screen size, depending on the PJ's zoom setting. I have found that my PJ actually shoots out about half of the fL. this calculator shows, I assume it's because I'm using Econo mode. If you are using Econo mode too that could well cut your true fL. figure down to 7-8 fL. with a new bulb! This is all supposition of course.
Take your time and get an accurate PJ output measurement and then change the bulb and take another; this will tell you what is REALLY happening with your PJ. :T
You all are probably getting tired of hearing me say this, but I wish people would spend the extra money (less than $50 to your door) to get a simple light meter so they can know
what their PJ's are really shooting instead of just guessing or going by a calculator that may or may not be right.