Originally Posted by bhc
Hi - Was contemplating setting up an backyard theater and read through the posts. Didn't see much about laser projectors being used outdoors.
I was about 80% sure I was going to go with the Epson 1450 when I came across the Optoma GT1090. Cost, lumen, and resolution appear similar, and neither have lens shift.... Didn't know if anyone had any thoughts.
Probably looking at ~ 120" screen, and the kids will use it some so nice not to have to wait until it's entirely dark to start.
Laser/LED has the benefit of relatively constant lumen output over time and use.
The UHD lamps like the HC1450 uses are a type of arc lamp. The lamps output will be at its brightest during the first 100-500 hours of use and at which point it will loose some percent of its output.
A projector is one part of a system which includes the screen as well as the environment it's used in. The image you see is a product of the projectors output (lumens), the amount of light reflected from the screen to your eyes (foot-lamberts), and the environment your in, i.e. how dark is it.
DLP projectors typically report their lumen output measuring only white light. So expect the Optoma GT1090's lumen output to be ~30%-40% less that the stated value with an actual color image displayed. In other words don't expect to get 4,200 lumens.
Epson reports its lumen output with consideration to color image output. It's quite safe to expect brighter image capability from the Epson HC1450. Epson projectors typically output slightly more lumens when tested than what is spec'd.
Both DLP and LCD projectors typically produce the best color when displaying something less than the stated maximum lumen output.
Good luck with not waiting until dark...
I've been working with front projection home theater for decades. We've been setting up outdoor backyard theater for 6 years now. I've yet to find a projector that will compete favorably with sunshine outdoors where the goal is to start the entertainment/movie early for the kids.
If your objective is to start early for the kids, do yourself a favor and buy a 75"-85" LCD TV to set up outside and call it a day.
It takes 15-20 minuets after sundown to get any kind of watchable/enjoyable image with a projector/screen outdoors. You can consult the internet for what is called "civil twilight" for the day you want to show a move. Civil Twilight is ~30 minuets after sundown and starting before is going to result in a washed out picture with little to no image visible.
FWIW, I've used the HC1450 and I currently use an Epson HC1060 on a 144" screen. The HC1060 will match the HC1450 output for a 120" screen quite favorably for half the cost.