I do not use my projectors in a dark environment. My walls are white and I have no intention of painting black walls or a cave environment. There is always ambient light and I usually use my main projector as a second screen to my computer network.
My main work lab space contains a few computers connected to three HDMI switchers. There are three active displays: two TV/projectors and one TV/monitor. I usually just have the PF1500w and my Sharp TV active while working on my computers.
The PF1500w and PF1500 look alike but differ significantly with pros and cons to each but as far as the picture is concerned the PF1500w is brighter and has a far better color balance.
1. The GUI is slow as molasses on the PF1500w yet attractive.
2. The original PF1500 has a much quicker interface but no where near as snazzy.
3. I can Miracast to the original PF1500 but not the PF1500w. You have to connect the PF1500w to a network to stream.
4. The PF1500 has component input and the PF1500w does not.
5. Both are quiet but the PF1500w is quieter than the PF1500.
6. The PF1500w has automatic picture adjustment (Live TV) whereas there is no automatic picture adjustment.
7. The TV tuner is faster and seems to be more sensitive on the newer PF1500w.
8. The PF1500 has a power design flaw that shortens its life if the user fails to compensate for that flaw. (Toggling sports mode by pressing the green button
9. The PF1500 is compatible with other LG remote controls. The PF1500w remote is Bluetooth (I think).
10. The PF1500w is much faster than the PF1500. In order to overlay my images I have to use the PF1500 in computer mode otherwise the lag on the PF1500 is really, really bad (170ms) in standard video modes. Computer mode restricts the aspect ratio to 4:3 and 16:9. Computer mode also significantly limits signal processing like contrast, color, gamut, etc.
11. The PF1500w has better contrast which makes the picture appear better.
12. The lens optics on the PF1500 is better but only if you examine the picture up close. The PF1500w has fringing which appear as double letter and significantly reduces the potential contrast. In other words, if LG had used a coat glass lens design it would have given elevated the picture to a new level. But I as it is, the fringing is not noticeable at normal viewing distances and only when I am viewing 4K material do I even care about the fringing.
13. The PF1500 takes a while to stabilize the image.
I am sure there are other differences but these are the things off the top of my head.
I try to ALWAYS use my PF1500 projectors in economy / max power savings mode so that I can get the benefit of the 30,000 hour projector life.
I own LG HW300T projectors. Two did not fare well and lasted about 12000 hours before the output dropped to unacceptable levels. I never used them in max brightness so I concluded that low power was the way to go.
When I learned about the PF1500 original, I was excited to learn that it had four corner picture adjustment. That feature meant that I could treat the projector like a subcomponent in a much bright super projector. Stacking projectors is a common way to increase the brightness. So I waited until the price dropped and bought two PF1500 projectors. I did not want to spend hundreds of dollars to buy a stacking rig (a fancy stand to hold one projector over the other) so I sat them side by side and adjusted the four corners of both projectors until they formed one picture. I doubled the lumen output and increased the brightness by 70 percent! So instead of running one projector on HIGH which would increase the noise and shorten the projector life I achieved the same effect for just a few dollars (I waited for my local merchant to offer a killer price).
So I have a PF1500w and a PF1500 sitting side by side. The pair in my living room gives a better image because the pixel geometry is better matched. But both duet PF1500 give a much brighter picture than a single projector.
: Actually, that was one of the first complaints about LGs 2000 lumen projectors: they barely seemed any brighter than the 1400 lumen projectors.
And speaking of environment, I own LG PH550 projector (I have three). I had quite a shock when I moved the same projector to three different rooms in my house. The difference in picture was so extreme that I thought I had somehow broken the projector. There were no screens but the reflecting boundaries from adjacent walls really did a number on the picture. And the only reason I noticed the picture differences was because the projector was nearly silent in one room but had an annoying hum in the second room. I realized that the best placement from the projector was the one place that created a standing wave: 10x20x40 (feet) dimensions. In trying to find the cause of the hum, I then noticed the degraded picture quality.