Projection and screens
How to Choose a Church Projector
Quick answer
A 150 inch 16:9 screen under normal service lighting needs 2,124 lumens at the screen, which rounds to a 2,500 ANSI lumen projector. That is 66.8 square feet of screen at a 35 foot-lambert target divided by 1.1 screen gain. Buy brighter only if the room has real daylight.
Lumens is the number on the box and foot-lamberts is the number that decides whether anyone can read the slides. A 5,000 lumen projector is dim on a 20 foot screen and blinding on a 6 foot one, which is why the question "how many lumens does a church need" has no answer until somebody states a screen size and how bright the room is. The arithmetic is short: screen area in square feet, multiplied by the foot-lambert target for your lighting, divided by the screen gain.
Run your own numbers in the projector lumens calculator before reading any product page, and if the screen size is not settled yet, the screen size calculator sets that first from your furthest seat. Screen size drives brightness, brightness drives budget, and doing it in the other order is how churches end up with a projector that cannot hold an image on the screen they bought.
On this page
Lumens by screen size and how bright the room is
Find your screen diagonal down the left and your honest lighting condition across the top. The honest part matters: almost every church says the house lights come down and almost none of them actually do it for the whole service.
A 150 inch screen needs 2,124 lumens under normal service lighting at 35 foot-lamberts, against 971 lumens with the lights fully down and 3,035 lumens in a bright room.
| Screen diagonal | Screen area sq ft | Lights down, 16 fL | House lights low, 25 fL | Normal service lighting, 35 fL | Bright room or daylight, 50 fL |
|---|---|---|---|---|---|
| 100 in | 29.7 | 432 | 674 | 944 | 1,349 |
| 120 in | 42.7 | 622 | 971 | 1,360 | 1,942 |
| 150 in | 66.8 | 971 | 1,517 | 2,124 | 3,035 |
| 180 in | 96.1 | 1,398 | 2,185 | 3,059 | 4,370 |
| 200 in | 118.7 | 1,726 | 2,698 | 3,777 | 5,395 |
Round up to the next 500 ANSI lumens when buying. These figures assume the projector delivers its rated output onto the screen, which is a generous assumption for reasons covered below.
Why you buy more lumens than the table says
The table gives the light that has to arrive at the screen. Three things stand between a rated projector and that figure, and all three are ordinary rather than scandalous.
Rated lumens are measured in the brightest picture mode. That mode is usually a green-tinted presentation preset nobody would run a service in. Put the projector into a watchable colour mode and a meaningful share of that brightness goes away.
Light sources dim with age. A lamp projector loses brightness steadily and is noticeably dimmer long before the lamp fails. Laser projectors rated at 20,000 or 30,000 hours, such as Epson Pro EX11000 3-Chip 3LCD Full HD 1080p Wireless Laser Projector or Optoma ZH551 - 1080p Full HD, 5600 Lumens, Laser, IP6X Dust Resistant, DuraCore 30,000 Hour Maintenance-Free, Miracast Wireless Screen Sharing Projector, 1080p, are usually specified to around half brightness at end of life. Either way you are buying for year five, not for the first Sunday.
Eco and quiet modes cost brightness. A projector mounted 15 feet above the congregation in a quiet room will end up in its quiet fan mode, which is dimmer.
The working practice is to buy roughly 1.5 to 2 times the calculated figure. For that 150 inch screen at 2,124 lumens, that means shopping in the 3,000 to 4,500 ANSI range rather than at 2,500, which is why a projector like Optoma ZH451 - Full HD 1080p, 4,600 Lumens, Miracast Wireless Display, Laser, Compact, Business and Classroom Projector, Regular Throw 1080p Miracast with its published 4,600 lumens is such a common church answer. That is margin for reality, not a reason to buy the brightest projector you can afford.
Choose a projector in seven steps
- Fix the screen size from the furthest seat. Under the six times rule for lyrics and sermon points, screen height is the distance to the furthest seat divided by six. A back row 40 feet out wants about a 6.7 foot image height, which is a 163 inch diagonal, so a 150 inch screen serves a room about 37 feet deep and a 180 inch screen serves about 44 feet.
- Measure the room at service lighting, not at rest. Stand at the screen wall during a normal service with the lights set the way they actually are. If you can read a printed page comfortably at the screen, you are in the 35 foot-lambert column or brighter. If there are windows behind the congregation with no covering, you are in the 50 foot-lambert column.
- Calculate lumens and apply the reality multiple. Screen area times the foot-lambert target divided by screen gain gives the requirement, then multiply by 1.5 to 2 for picture mode, ageing and fan mode. Round up to the next 500 ANSI lumens. This is the number you shop against.
- Decide the light source on how long you keep it. Lamp projectors cost less to buy and need a lamp every few thousand hours, at a cost and a ladder trip each time. Laser projectors rated 20,000 to 30,000 hours have no lamp to change. For a ceiling mount in a sanctuary, laser usually wins on total cost and always wins on nobody having to get the lift out.
- Check colour brightness, not just white brightness. A 3-chip 3LCD projector produces the same colour brightness as white brightness. A single-chip DLP projector can measure far lower on colour than its headline white lumens suggest, which shows up as washed out lyrics on a coloured background. If the manufacturer publishes a separate colour brightness figure, use that one.
- Match the throw ratio to where the projector can physically go. Throw distance equals throw ratio times image width. A 150 inch screen is 10.89 feet wide, so a 1.2:1 lens sits 13.1 feet back and a 2:1 lens sits 21.8 feet back. If the only mounting point is close to the screen you need a short throw or an ultra short throw projector, which is a different purchase entirely.
- Buy the screen deliberately, not as an afterthought. A fixed frame screen with a black velvet border gives a crisper edge than a painted wall, and an ambient light rejecting surface does more for contrast in a room with windows than another 2,000 lumens would. Screen gain also feeds straight back into the brightness calculation.
Light source and chip type, decided honestly
Two specification decisions account for most of the price difference between projectors that look similar on paper.
A laser light source rated 20,000 to 30,000 hours removes every lamp change from a ceiling mounted projector, which is the decision that saves the most money and effort over a ten year install.
| Choice | What it costs up front | What it costs later | Where it is right |
|---|---|---|---|
| Lamp | Least | A lamp every few thousand hours, plus a lift and a volunteer | A portable or fellowship hall projector that is easy to reach |
| Laser, 20,000 to 30,000 hours | More | Nothing for the life of most installs | Any ceiling mount, and any church tired of buying lamps |
| 3-chip 3LCD | More at the same white lumens | Filter cleaning on some models | Lyrics and text on coloured backgrounds, where colour brightness matters |
| Single-chip DLP | Less at the same white lumens | Sealed models need almost no maintenance | Bright rooms on a budget, if you verify the colour brightness figure |
| Ultra short throw | Most per lumen | Same as its light source | Low ceilings, and platforms where people keep walking through the beam |
Specifications are the manufacturers’ published headline figures for the models in our catalogue. Where a figure is not published we have left it out rather than estimate it.
What to buy at three real budgets
For a fellowship hall or a small sanctuary where the lights can come down, a 120 inch screen in a dim room needs 971 lumens, so almost any current projector clears it with margin. Epson Pro EX9270 Wireless 1080p 3-Chip 3LCD Business Projector at $999.99 is a 3-chip 3LCD, which is the specification that matters more than the headline number here.
For a mid-size sanctuary with a 150 inch screen and normal service lighting, the calculation says 2,124 lumens and the reality multiple says shop at 3,000 to 4,500 ANSI. Optoma ZH451 - Full HD 1080p, 4,600 Lumens, Miracast Wireless Display, Laser, Compact, Business and Classroom Projector, Regular Throw 1080p Miracast at $1,099.00 publishes 4,600 lumens with a 30,000 hour laser, and Epson Pro EX11000 3-Chip 3LCD Full HD 1080p Wireless Laser Projector at $1,399.99 is the 3LCD laser answer at a similar price. Either removes lamp changes permanently.
For a large room, a 180 or 200 inch screen and lighting that never comes down, you are looking at 4,370 to 5,395 lumens by calculation and more in practice. Optoma ZH551 - 1080p Full HD, 5600 Lumens, Laser, IP6X Dust Resistant, DuraCore 30,000 Hour Maintenance-Free, Miracast Wireless Screen Sharing Projector, 1080p publishes 5,600 lumens in a sealed dust resistant engine, which matters for a mount nobody wants to reach, and Epson PowerLite L530U Long Throw 3LCD Projector at $2,749.00 is the WUXGA install answer. If the room has no depth for a long throw, BenQ LK936ST 4K Ultra HD Short-Throw Laser DLP Projector is a short throw at a large screen, and Epson PowerLite 805F Ultra Short Throw 3LCD Projector - 16:9 - Wall Mountable, Tabletop is the ultra short throw option for a low ceiling. Full comparisons live in the church projector roundup and, for a smaller room, projectors for small churches.
Two comparison pages settle the remaining arguments: laser against lamp and three chip against single chip. Where the projector physically goes is a placement problem, and what drives the slides is covered in projection software and hardware.
The screen is half the decision
Screen gain sits in the denominator of the brightness calculation, so it changes the answer directly. A 1.1 gain matte white surface is the default and the safe choice, because it looks the same from every seat. Higher gain surfaces return more light toward the centre of the room and less to the seats at the sides, which in a wide sanctuary is a real loss.
An ambient light rejecting surface such as Elite Screens 150-Inch ALR Projector Screen 16:9 – Ceiling & Ambient Light Rejecting, Fixed Frame Wall Mounted, ISF-Certified CineGrey 3D for Home Theater, Standard Throw Projectors, ER150DHD3 is the exception worth paying for. It reflects light arriving from the projector and absorbs light arriving from above, so in a room with clerestory windows or lighting that cannot come down it improves contrast in a way that buying more lumens does not. Contrast, not brightness, is what makes text readable in a lit room.
For a permanent position, a fixed frame screen such as Elite Screens Sable Frame B2 120" Fixed Frame Projector Screen SB120WH2 at $352.55 or Elite Screens Sable Frame B2 150" Fixed Frame Projector Screen SB150WH2 gives a flat surface and a black border that absorbs overspill. For a shared room, a pull-down such as Elite Screens Manual Series, 120-INCH 16:9, Pull Down Projector Screen with AUTO Lock, Movie Home Theater 8K / 4K Ultra HD 3D Ready, 2-Year Warranty, M120UWH2 or a motorised screen such as Projector Screen Elite Screens Spectrum, 150-INCH Diag 16:9, Motorized Projection Screen Movie Home Theater 4K/8K Ultra HD Ready, Black Case, ELECTRIC150H2 keeps the room usable for everything else during the week. The trade is covered in fixed frame against motorised, and every screen option is in the screen roundup.
Sources
- Manufacturer published specifications for the projectors and screens named
- Foot-lambert targets by ambient condition as used across this site
- AV design viewing distance standards behind the four, six and eight times rule
Frequently asked questions
How many lumens does a church projector need?
It depends entirely on screen size and room light, which is why a single number is useless. A 150 inch screen under normal service lighting needs 2,124 lumens at the screen, a 120 inch screen needs 1,360, and a 200 inch screen in a bright room needs 5,395. Calculate screen area times your foot-lambert target divided by screen gain, then buy 1.5 to 2 times that figure.
What are foot-lamberts and why do they matter more than lumens?
Foot-lamberts measure the light actually reflecting off the screen toward the congregation, which is what the eye responds to. Lumens measure what leaves the projector. The same projector produces very different foot-lamberts on a 100 inch screen and a 200 inch screen, because the same light is spread over four times the area. Design to a foot-lambert target and the lumens figure follows automatically.
Is a laser projector worth the extra money for a church?
For any ceiling mounted projector, usually yes. A laser light source rated 20,000 to 30,000 hours outlasts most installs with no lamp changes, and every lamp change on a ceiling mount means hiring a lift or assembling scaffolding as well as buying the lamp. For a portable projector that lives on a cart and is easy to reach, a lamp projector is still a reasonable way to save money.
Why do our lyrics look washed out even though the projector is bright?
Two likely causes. The first is colour brightness: a single-chip DLP projector can deliver far less colour brightness than its white lumens figure suggests, which shows up exactly as washed out text on coloured backgrounds. The second is ambient light landing on the screen, which raises the black level and destroys contrast. An ambient light rejecting screen fixes the second one better than more lumens will.
Should we buy a 4K projector for church?
Rarely. Lyrics, sermon points and scripture are large text that looks identical at 1080p, and the presentation computer, the cabling and the streaming chain all have to carry the higher resolution too. Spend the difference on brightness, on a better screen surface or on a laser light source, all of which change what the congregation actually sees. A 4K short throw makes sense only for a very large image from a close mount.
Does screen gain really change how bright a projector needs to be?
Yes, directly. Screen gain divides into the lumens calculation, so a 1.3 gain surface needs about 15 percent fewer lumens than a 1.1 gain surface for the same result. The catch is that higher gain concentrates light toward the centre, so seats at the sides get a dimmer image. In a wide sanctuary a 1.1 gain matte surface that looks the same everywhere is usually the better engineering choice.
Researched, not professional advice. This page is compiled from published manufacturer specifications, operator manuals, FCC rules, published standards and owner-review consensus, not hands-on testing. Sound system design, rigging loudspeakers overhead, and any electrical work are jobs for a qualified professional: have flown loudspeakers and their attachment points signed off by a structural engineer or a certified rigger, and have all wiring done by a licensed electrician to your local code. Wireless microphone rules change, so confirm the current FCC position before buying. As an Amazon Associate we earn from qualifying purchases.