Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: What's the difference between the Optoma's HD25 and HD25e?
Document: I purchased the Optoma HD25e to replace my old HD72. I was debating between the HD25, the HD25e and the HD25LV and chose the 25e since the room it is in has controlled light but wanted something bright enough to make the picture pop when the doors to the room are open which allows a good amount of ambient light in. I can say that the picture on the HD25e projects a very bright and super clear picture watching my Directv HD channels. I popped in a blu ray and the picture was incredible!
Like so many other comments on here I was down to a few projectors - the BenQ 1070 and the Epson 2030. I am very happy with my choice. Obviously I can't speak for the other projectors but I can tell you that the Optoma is an amazing projector. I moved up from an Infocus SP5000 purchased in 2005. The difference is night and day. Picture quality, color, brightness and so forth are far superior on the HD25e.
Three years ago I bought an Optoma HD66, which is a 720p projector. I wanted an upgrade so I did a few weeks of research online and finally decided on the HD25e. It was very much worth the upgrade. I was hesitant and first thinking it may not be a big enough difference to satisfy me.First the black levels are very good. I would wager there isn't a projector under a $1000 that have better black levels than the latest Optoma projectors. Tons better than my HD66.
Bought this and mounted it to replace a rear projection that was hogging up space in my basement. Love it so far. Color and brightness are fantastic (after a bit of tweaking). I thought it would be much louder than it is. It emits a low hum that is easily drowned out by my(or it's own) speakers. The lamp this projector uses is also a couple hundred dollars less than the HD25 and HD25-LV.
We have asked Optoma representatives several times for color wheel information but they have declined to comment. Both the HD25-LV and the HD25 are actually very quiet in operation, but you are correct that Eco-mode is quieter still. "To add even more mystery, Optoma just replaced the HD-25 with the HD-25e. This new "e" version approaches the brightness of the LV models yet uses a new more efficient lamp.
Consumers don't know what to make of the HD25 models variations being introduced on an almost monthly basis. The LV model has greater light output yet uses the same 240w lamp! Projector Central asked WHY but Optoma declined to answer:"The HD25 and HD25-LV have the exact same fan noise. I have added a comment in the article to this effect. As far as "how is that even possible," I do not want to speculate.
Avatar was something I missed in theaters and I thought I'd never see it in 3D - but with this projector I was blown away.The fact that the bulb price is much lower for this model is a key selling point also. When the bulbs cost more than $300 like for other projectors (even the Optoma HD25, non "e" version) you try to cut corners and get knock-offs, and I've had bad experiences with them.
The glasses darken it so it just brings it up a bit. The 3D is mind boggling. Avatar is jaw dropping. Just being able to bring this technology into a home is amazing. When watching a simple movie on Dish it's totally absorbing; almost no difference to a theater and the popcorn is free. Very pleased.
Besides that - the quality of the image, the realism of the 3D is beyond description!An important thing to know about this projector is that the Sainsonic SSZ-200DLB work perfectly with it. I purchased the Optoma DLP glasses and the Sainsonic SSZ-200DLB to compare the two and found no difference in the quality of the image from the Sainsonic glasses. The Optoma glasses were a bit more comfortable but once you get into the 3D you won't even remember you are wearing the glasses anyway.
Again, from the reviews it seems the current 25e projectors have more uniform focus than my first release original, the early model focus was repaired free in warranty, and focus is reasonably uniform on my new replacement. Even on my old one I doubt most people would have noticed the difference from a high-end projector on anything but a very sharp 1080p movie, or displaying small computer text.The color and brightness are just stunning.
Answer: The only significant differences are lumens(brightness) and power consumption.HD25 = 2000 ANSI lumens ; HD25e = 2800 ANSI lumens.HD25 = Max 339W (Normal), Min 241W (Eco+), <0.5W (standby-ECO) ; HD25e = Max 262W (Normal), Min 191W (Eco), <0.5W (standby-ECO).You're better off with the HD25e as it is brighter and uses less power. Also, the HD25e does not come with a lens cap like the HD25 does, but this seems pretty trivial to me.