My testing of 4 stacked projectors, 20,000 lumens brightness comparison vs 3 vs 2 vs 1 Cheap DIY 20,000 lumens projector brightness testing, comparsion

You could put two different colored gels in front of the lenses to help take the guesswork out of which grid is from which Beamer. Red and green for example. On perfect registration you’ll get yellow lines.

I built this rig for a recent event (September 15, 2016) and it works I used it for over 6 hours! There are some caveats though... There are omissions in the video and perhaps they aren't entirely necessary, but would have been nice. 1 - Decide on how you can position your projectors on each board. Mine were mounted using the straight edge of the board to keep each one aligned. Position also has to consider the lens' position left and right. 2 - Create a paper template for the projector mounting points. This will make drilling holes way easier. 3 - Drill the corner holes slightly larger than the threaded rod. You need enough play that the boards do not hang when you move them. 4 - The video implied that tweaking the blending of the two projectors was an easy thing to do. It is not. 5 - As the video states, you must have a projector that allows for corner HDMI adjustments. 6 - Turn off remote control on the upper unit as the video stated. Use the wireless remote for the lower unit. 7 - If you do events, determine how far you need to be away from the screen. Once you have this setup you will not want to move it. This thing is a real pain to setup. I used MDF and the threaded rod would easily get hung up when moving the top board/shelf. It does not double the brightness, but it does make enough of a difference that it is worth the hassle. That is all.

Absolutely amazing even today I've been stacking Panasonic 6700 for my kids out door movie theater and this helped a lot

Great job Tim! Our school wanted to get a big projector for our auditorium but the huge ones were just too expensive. This will be a great alternative to try out! Thank you!

Great set up especially for a basic dual platform for the projectors. For those who argue the technical aspect of getting 10,000 lumens from two 5,000 lumen projector, I say the main point is you are getting a stronger picture for way less than a 10,000 lumen projector cost wise. Wonder what a light meter would read for the two projectors verses just for one?

Thank you so much for posting this Tim!. I was able to stack two of the Epson 1940W projectors and use them on a 14' x 8' da-lite rear projection screen. This worked well at two events for over 1,000 viewers where we had no control over the lighting.

Absolutely brilliant! Thank your for saving us $14,000+. This makes so much sense, yet I would have not thought of it. You have been of tremendous service - thank you!

Great work Tim. Nice rig. This is a tried and true method to get more brightness from projection systems and your DIY rig is a very economical approach. Please note however that doubling the number of projectors does not double the lumens. The brightness increases logarithmically, not linearly. So two 5,000 lumen projectors equal something around 8,500 lumens as I recall (perhaps another commenter could do the math for us based on the Inverse-Square Law.) Each projector added brings less of an increase, with greatly diminishing returns beyond 4 projectors.

very smart. cheap and effective solution. This design is amazing. during a movie event when 1 projector light bulb died u still can continue to watch the rest of the movie with half the brightness. The $13,000 projector cant do that. So, your design is a winner over the more expensive one. nicely done.

For people who say this doesn't work my guess is they never buy anything with more than one bulb, LED flash lights, photo lighting etc, because more bulbs never add more light. laugh. :) and their car has one head light only. ;) so what if lumens aren't exact. give the guy credit for saving money. great job. God Bless

Thanks for these videos about stacking projectors. I have only just come across the concept of stacking, so this is great information for me. For more stability in the stacking stand, I would suggest that if you installed a second Nut below the Nut that sit under the platform you are adjusting, the second Nut would prevent the first Nut from any movement due to vibration or thermal changes overtime. I used to make aircraft parts and we would use this double Nut method to ensure the Jigs would not lose their tolerance. You will adjust the bottom Nut as demonstrated in this video and then when you have it in the right place you can secure it by tightening the second Nut up against the first, that way the first Nut will remain in the perfect position.

Projector alignment is spot on, but 2 x 5k does not equate to 10k. Stick a meter on it and you will see that you'll only actually get around 7.5k ANSI. Don't take my word for it though, try it yourself.

I'd be interested to see this technique with a couple of polarizing filters for a proper (non-interleaved) 3D projection using the passive glasses that they have in the cinema (as opposed to the expensive shutter glasses used on 3D TVs and 3D projectors). I guess it would depend on getting video that is separable into two synchronised streams and finding a polarizing filter that isn't too dark and doesn't melt in front of the lenses...

Nice tutorial, it seems to me that projectors with vertical lens shift would be better suited for this, as there would be no need for digital keystoning and thus no loss of quality.

I do a large Christmas display at my home for Angels for Animals and Toys for Tots. THANK YOU for this video. Very simple, practical and effective. Its solves my problem and opens all kind of doors and creative processes. Thank you for sharing.!!!!

Combined brightness will be 10,000 lumens, however our eyes and ears perceive a doubling in sound or light output on a logarithmic scale. Hope this answers some questions and clears any confusion!

This is a GREAT video. Thank you SO much for taking the time to make such a clear and easy to understand video for no other reason than to help the rest of us!!

This tutorial is AMAZING! Thank you!

Hi, the truth is that this video I did not see anywhere and the idea is great, thanks for sharing and I will put it into practice friend thanks :)

Man ur a smart man would gave figured that out by the time of the end of the world life or death situation. But in today's time things r very costly and it pays to have time and patience ! You made this look easy and it is with ur instructions u save a lot if people with the resources and not enough money achieved the goal they thought they were sold when we buy a decent projector but double two into one to combine light into time and sync them we might be closer to time travel then we think!!!!!

Very cool. I would have made the shelves out of thin aluminum with holes, and made them closer together. Everything else was new to me though. Good job.

Even more comfortable it's with NEC Stacking correction tool, which is supported by several of their projectors. Allows to stack up to 4 devices.

Wow I cant believe I've never thought of this, thank you!

We used to do that same thing with two 10k's! Though it may have been more for a if one projector goes down the other one still running sort of deal.

Thanks for sharing Tim, I help out in a school and during plays our rear projection screen does not pump out enough light to contrast with our theater lights, I think Ill have a go at this.

GREET JOB !!!!!!!!! ALL THE HATERS OUT THERE ARE JUST PISSED THAT YOU SAVED 14,000 $ TO GET THE SAME PICTURE THEY PAID $20,000 TO GET!!!!! LOL

I have the cree x2000vx rgb 88watts led projector and its pretty bright and with higher wattage rgb leds and different lense options it could of easily been manufactured for large venue use at similar cost.

Great idea, man! What a clever way to accomplish the task!

If I had a pair of identical projectors mounted on the ceiling together (and I do) I would want to be able to control them independently with their IR remotes, but of course messages from remote will go to both units. It would be interesting to try taking a page from the playbook of polarizing-3d-projector fan (which I am). One could add polarizing filters to the ir sensor of each projector, each at 90 degree angle difference from each other and install one on the output of a remote. In theory turning the remote one way should give commands to just one projector and turning it 90 degrees would send messages to the other. Also since you have two projectors you have two remotes (hopefully). You could put polarizing filters on both remotes (at 90 degree angles) and fun-tack the remotes to a board for convience. If all goes well you could then control each projector with each remote when its tuned right. This is all in theory, but it might be worth a try. I personally have not been motivated to do this since my home theater projectors can be reached just by extending my arm upward. In churces the projectors are mounted considerably higher up. :-)

Awesome Thanks very brilliant. I save $1000 of dollars thanks to you Tim

this would also be a great 3D set up but you would need a few more items like an aluminum screen and good polarizing filters

Incredible idea. Thanks for this. Well done.

Absolutely amazing! Congratulations and thanks for sharing!

I would had tryed to mount them with the top one upside down and slide shifted so the lenses comes alinged each other and to reduce the gap between each of them at the minimum ( top to top) projector, almost touching. That way, alignment would make more sense as the light sources would become almost near as a single light souce.

Actually, based on Disneyland Resort's Disney California Adventure mostknown attraction, World of Color does use this type of projector stacking. The reason why they did it this way is to make a very bright projector (my possible guess to the actual lumens of the professional type projectors are possible at least 20,000 lumens) they used the same way as Tim did in order to projector that vibrant image through the water screen. On my opinion, doubling a single 5,000 lumen projector will not give you a 10,000 lumen projector in total, it is possible that it will only total up to 7,750 lumens or even 8,050 lumens in total.

Very creative; good thinking; excellent presentation. Thank YOU!

I don't need 2 projectors. But that platform is "top shelf" nice.

Great video, now to experiment with multiple projectors

This is brilliant. Well done!

I absolutely love your video it’s smart and gracious fun to watch as well, thank you

Well done for coming up with this solution... And thank you for sharing it

This is a cool solution. Sounds like someone should sell an auto aligning projector system where you can have from one to 4 projectors for various venues.

Awesome video. The comments blow are comical. It doesn't take a genius to understand that turning on two bulbs of equal wattage in a lamp shade put out more light than one. It's the same with any light source.

Great idea. Great execution of it.

very professional video! i may be using your solution in the near future.

Great tutorial! Thanks for showing us this. I think this will be very useful to many people. I know it will be a big help to me. Thanks again

Just what I'm looking for. Thanks for sharing.

Great tip for saving Ken.

its like setting the register on a printing press

Isn't htere software that will merge multiple projectors?

I think that this is a great solution. The only caveat that I'd offer is that you are taking a hit to contrast. But the proof is in the projection and I'm sure that when you're using your 2x or 4x rig, the image looks better and better for your application the more of the projectors you turn on. When you're chaining projectors, have you noticed any lag in signal further down the chain? Or is the 4th projector's signal still seemingly in sync with the first one?

Great vid Tim! THX for posting!

Cool idea, but not an original idea. But still a great video, and if you are new to this, it is pretty darn cool. What I would like to do is a create a super gigantic screen using say 2 projectors with images side by side.

what if you want to display them side by side and create a larger image?

How does the 3 D mapping come in? I thought mapping takes over the front and sides of the building🤦🏻‍♂️

Thats pretty cool. Thanks for sharing your expertise.

Hi Tim, this is a great tool for using projection mapping and stuff... We are a church here in Mexico and I was wondering if there is any way of achieving this with projectors that doesn't have the corner keystone option? Please let me know if there is a tweak or something we could do with this projectors so we can make it happen! Thank you!

your geometry is way off, you should get projectors with lens shift and move them closer together. maybe consider 3 legs 2 up front 1 rear and stacking them on the bodies. corner correction should come last. because if you align them right, each time you move them or bump them they DON'T need to be readjusted

what u think about using 2 mirrors to make a shortrhow projector? the firt image will be inverted...the second mirror will solve the proble?

Nice rig but you can't get 10,000 lumens using 2x 5000 lumens projectors . The additional lamp brightness adds only 1/2 of its rated brightness when mixing the light . So you have 7500 Lumens with this setup not 10K.

Very Smart and well prepared

i love how wild99hd says it doesn't work, as if stacking the two projectors creates a black hole and makes less light. The goal was to make a brighter image, it worked. Thanks Tim z for the explanation this has solved my problem i believe. How large can these projectors confidently project?

I thought you were making a 3D projector xD But at the end of the video I finally realized that wasn't the case :3 Pity... I know you can project "3D" with this setup, but I don't know how would any kind of glasses work... If you have any idea how, please give it a run.

Good way to buy 2 6000 Hour Projectors and put them both in eco mode and do this setup. You get double the lumens and extended lamp life.

so you can do this with more than one they can show the same image just make it bigger but be closer

i loved the solution! i was wondering if can anyone help-me find out a 5000lumen+ full hd projector for doing this rig!??

God bless you in your ministry :)

Great and so easy thanks to you

What's the end result picture size in inches (am looking for 300" size and more

Could you reduce weight with smaller threads (bolts) and use aluminum for your shelves? Those Epson Projectors are not that heavy. Also if you don't mind used projectors like the Epson you have and even better models with prices under $200. Or less less than $100. Let me know I can give you a couple of places to look.

Thank you for sharing this it's very helpful!

Is that tandem tested with lumetro? two 5000 lumen projectors don't add up to 10000 lumens, I think you should check the inverse square law first.

EP2250U PowerLite 2250U 5000lumens 3LCD that's the one I want to buy is it better than the one in your video or same

Thanks!

Very good. Thanks Tim!

How did you drill out the holes for projector mounting screws? Did you use a template?

You are a genius! Thanks a lot!

If you change the position of the projectors after calibration, same process has to be repeated. Correct me if I'm wrong

Muy bueno,pero seguro que se vera algun sombreo en las imagenes.

Lovely inventions

Great video

Need to know how to alignment projector by stereoscopic player or other way?

Man, you don't explain how you put the base on the tripod, what type of adapter do you use

very creative. Nice work!

bravo man, you rock. very well done video. thank you.

Saving this video thank you for your insight! Tim Z!

does anyone know the screen size possible to achieve with excellent quality.

very good video

Awsome video very detailed. I will try to build this in near future. I also found this video of special ICE screens that can help you get brighter image. If any of you want to take a look, but i can imagine they are pretty expensive. Stunning Daytime Projection demonstration uncovers the truth about projection screens.

would it be possible to stack 2 panasonic pt-dw5100u any ideas if they have corner keystone correction?

Verry good ideea

GREAT BUILD SIR!!

I can build the rig but not sure I can set the projectors up the video seems fast but can I consult u for a cost

Nice idea and innovative. Thx!

Great build!

Great DIY. Thanks for sharing. :)

Awesome!!! Thank you for sharing!

Very cool

Ingenious! Thanks!