How to read a projector spec sheet

There are at least four different measurements sold to consumers as “lumens” and only two of them can be compared with each other. ANSI IT7.228 and ISO 21118 both put a meter at nine points across the projected image and average the readings. ISO is the stricter of the two: it additionally requires production units to deliver at least 80% of the rated figure. Because they measure the same thing the same way, an ISO number and an ANSI number sit on one scale — though for identical hardware the ANSI figure typically comes out a few percent to around a fifth higher, because ISO’s test conditions are tighter.

LED lumens and “light source lumens” measure the emitter before the optical system throws most of it away. By the projector industry’s own accounting the conversion runs 30 to 50 percent. CVIA lumens, the China Video Industry Association standard, also averages nine points but permits a colour-temperature window from 6000 K to 18000 K, so its numbers run higher than ANSI for the same hardware and are not interchangeable with it. And a figure with no standard beside it at all is not a measurement.

Of the 63 projectors in this catalog, 63 publish a figure measured to ISO 21118 or ANSI. The rest carry a visible “not on the ISO scale” mark and sort after the comparable ones whenever the catalog is ordered by brightness, rather than being quietly mixed in. 2 projectors here print a box figure that differs from its standardized one — the Yaber K3 is marketed at 1,600 and measures 990 to the standard.

This is not only a small-brand problem. In September 2023 XGIMI, one of the largest smart-projector brands, agreed after a complaint from Epson to restate the brightness of four models worldwide: the Horizon and Horizon Pro went from a claimed 2,200 ANSI lumens to 1,500 ISO lumens, and the Halo and Elfin from 800 ANSI to 600 ISO. Those are reductions of a quarter to a third on products already on shelves.

The practical range here: Anker Nebula Capsule Air at 150 lumens up to Hisense L9Q at 5,000, both measured to a nine-point standard. Roughly speaking, under 1,000 is a dark-room number, 1,500 to 2,500 works in a dimmed room on a 100-inch screen, and past 3,000 you can leave a lamp on.

Throw ratio is the distance from the lens to the screen divided by the image width — the industry writes it D:W. It is the only spec that can make a projector physically impossible in your room, and it is the one this site computes from on every page:

image width = distance ÷ throw ratio
16:9 diagonal = width ÷ 0.8716

A 1.5:1 projector needs 1.5 times the image width in room depth. A 100-inch 16:9 screen is 87 inches wide, so that is about 11 feet. A zoom lens turns the single ratio into a range: the Epson Home Cinema 5050UB spans 1.35–2.84:1, which is several feet of freedom in where it can sit.

At the other end, Epson EpiqVision Ultra LS800 has a throw ratio of 0.16:1, which puts a 100-inch image on the wall from barely more than a foot away. That is what ultra-short-throw means, and it is why a laser TV lives in a cabinet rather than on the ceiling.

Every card and every projector page here prints one derived figure from this formula — the screen size at 10 feet for normal-throw projectors, and the distance needed for a 100-inch screen for ultra-short-throws, because that is the end of the equation each type is actually bought on. The median projector in this catalog makes a 115-inch diagonal from 10 feet at its widest zoom setting. Every one of these figures is an estimate: a real install loses a little to lens offset and zoom ranges are quoted at the extremes of the lens.

Three honest descriptions and one evasive one. A native 4K projector has an imaging device with 4096×2160 or 3840×2160 real elements — in practice JVC’s D-ILA or Sony’s SXRD panels. This catalog has 5 of them.

Pixel shift — sold as XPR, 4K PRO-UHD, e-shift and several other names — takes a 1080p or 2716×1528 device and moves the image two or four times per frame, addressing 8.3 million pixel positions from fewer physical mirrors or cells. This is most of the 4K market and 41 projectors here use it. It genuinely looks sharper than 1080p, partly because the shift fills the gaps between pixels and removes the screen-door texture altogether.

1080p is a real and honest specification, and on a screen under about 100 inches at a normal seating distance the difference from pixel-shifted 4K is modest. What is not honest is “4K supported” or “4K compatible” with no native-resolution line: that means the projector accepts a 4K signal and downscales it, which every 1080p projector does.

Where resolution sits in the order of things that matter: behind contrast and brightness. A pixel-shift projector with good black levels beats a native-4K one with bad black levels from every seat in the room.

Single-chip DLP uses one array of micromirrors and shows the colours in sequence, filtered by a spinning phosphor wheel or by strobed LEDs and lasers. It produces the sharpest pixel edges and the lowest input lag in the category, and it is the only technology that can produce the rainbow artifact — brief coloured flashes on bright objects against dark, which a minority of viewers perceive. The full explanation of that.

3LCD splits white light into red, green and blue paths with a panel each and recombines them. All three colours are on screen at once, so there is no rainbow artifact and colour brightness equals white brightness — which matters because a single-chip design with a white segment in its wheel can post a high white-lumen figure while producing noticeably dimmer colour.

LCoS — sold as D-ILA by JVC and SXRD by Sony — is also three-panel, and its reflective liquid-crystal design blocks light far more completely when a pixel is off. That is why every published native-contrast figure above 20,000:1 in this catalog comes from an LCoS projector, topping out at JVC DLA-NZ800 at 100,000:1. The trade is price, size and weight: the LCoS models here weigh up to 50.9 lb.

Native or on/off contrast is the ratio between a full-white frame and a full-black frame with all processing off. It is the figure that describes the imaging device, and it is the one that predicts how a night scene will look.

Dynamic contrast is measured with an auto-iris or laser dimming actively closing down on the black frame. Nothing about it is fake, but it describes two different projector states rather than one image, and it is why marketing figures reach into the millions. Of the projectors in this catalog, only 17 publish a native figure at all; the rest publish a dynamic one or nothing.

The published native range here runs from Anker Nebula Mars 3 Air at 400:1 to JVC DLA-NZ800 at 100,000:1 — a spread of more than two hundred times, which is wider than any other specification on this page varies. When a maker publishes no native figure, that silence is itself information.

And the room beats the projector. Light bouncing off a white ceiling and pale walls back onto the screen will destroy a 100,000:1 native contrast ratio faster than any panel limitation. Dark surfaces near the screen are the cheapest contrast upgrade available.

Input lag is quoted per signal mode, and makers quote their best one. A projector advertised at 4 ms means 4 ms at 1080p/240; the same unit is usually around 17 ms at 4K/60. Both numbers are true and they describe different things, so this catalog stores them separately and prints the mode alongside.

The fastest published figure here belongs to ViewSonic X2-4K at 5 ms. 5 projectors accept a full 4K/120 signal, which requires a 48 Gbps HDMI 2.1 input — most projectors advertising 120 Hz mean 1080p at 120 Hz, which is a real feature and a different one.

Rough thresholds: under 20 ms is imperceptible for most players in most games; 20 to 40 ms is fine for single-player and noticeable in competitive shooters; over 50 ms is a problem for anything with timing. Film and television do not care at all.

Lamp projectors use a high-pressure mercury or metal halide bulb rated 3,500 to 4,000 hours in normal mode. They are still the cheapest route to high brightness — the brightest sub-$1,500 projectors in this catalog are lamp-based — and the bulb is a genuine recurring cost. 5 projectors here are lamp-based.

LED sources last 20,000 to 30,000 hours, switch on instantly and hold colour accuracy over their life. They top out lower on brightness, though the best LED projectors here reach past 3,000 ANSI lumens.

Laser-phosphor fires a blue laser at a phosphor wheel to make white, then filters it. It is the mainstream laser approach: 20,000 to 30,000 hours, high brightness, and a colour gamut limited by the phosphor and the filter wheel.

RGB tri-laser uses three narrow-band lasers and skips the phosphor entirely, which is why these projectors quote coverage past 100% of DCI-P3 and sometimes past BT.2020. 15 projectors here use one. The trade-offs are real: narrow-band light produces visible speckle for some viewers, and the designs in this class tend to publish low native contrast.

Light-source life in this catalog runs from 3,500 hours on Epson Home Cinema 3800 to 30,000 on Yaber T2 Plus. Every one of those figures is quoted to half brightness, not to failure.

Optical lens shift moves the lens assembly relative to the imaging device, sliding the picture up, down or sideways with no distortion and no loss of resolution. Digital keystone does the same job by reshaping the image in software, which throws pixels away — on a 4K projector you are discarding part of what you paid for.

17 of the 63 projectors here have optical shift, and the ranges vary enormously: some offer ±10% vertical, enough to clear a coffee table, while the 3LCD and LCoS home-theater models reach ±96% vertical and ±47% horizontal, which will hit a screen from almost any shelf, ceiling or back-wall position.

Automatic keystone on a lifestyle or portable projector is a genuine convenience and the right call for something you move nightly. On a permanently installed projector it is a sign the install is wrong: square the projector to the screen, use optical shift for the offset, and leave keystone at zero.

HDR was designed for displays that emit light and hit hundreds or thousands of nits. A projector spreads a few thousand lumens over a hundred inches of reflective surface, so it cannot reach those peaks — which means every projector has to compress, or tone-map, HDR content into the range it actually has. How well it does that matters far more than which logos are on the box.

HDR10 is static: one tone curve for the whole film. HDR10+ and Dolby Vision carry per-scene metadata so the tone curve can change shot to shot. 17 projectors here support Dolby Vision, and they are almost all lifestyle and ultra-short-throw models — the dedicated home-theater brands generally implement HDR10+ and their own scene-adaptive tone mapping instead.

That in-house processing is often the better answer. JVC’s Frame Adapt and Epson’s scene-adaptive mapping analyse the incoming image and remap it to the projector’s real capability without needing metadata the disc may not carry. If your library is Dolby Vision-first the format list narrows your options fast; otherwise, judge the processing.

Every maker publishes two noise figures. The quiet one is eco mode, which costs roughly a third of the brightness. The normal-mode figure is the one that describes how the projector behaves when it is doing the job you bought it for.

Normal-mode figures in this catalog run from 22 dB on Epson EpiqVision Mini EF22 upward. Below about 26 dB a projector disappears into a room; above about 33 dB it is audible during quiet passages, and in a small room it may be closer to your head than the speakers are. A ceiling mount, a longer throw distance or a soffit all help more than a spec sheet suggests.

A projector is half of a system and the surface is the other half. A smooth, flat, matte white wall is a usable surface and in a genuinely dark room it gives up very little to a mid-priced screen. Texture is the disqualifier — if you can feel the wall, you will see it on a 4K image — and so is any sheen, which produces a hotspot no brightness setting fixes.

Ambient-light-rejecting screens work by accepting light from one direction and dumping light from others into a black layer, which makes their geometry a specification you have to match. A lenticular UST screen accepts light from steeply below and rejects everything above and to the sides; an angular-reflective screen for a ceiling-mounted projector does the opposite. Pairing the wrong one with your projector makes the picture worse, not better, and it is the most common reason an expensive screen disappoints. Which type to buy.

Ultra-short-throws are the case where the screen is not optional. The same extreme angle that lets the cabinet sit against the wall is what an ALR screen exploits, and a UST on bare drywall throws away most of what it cost. Budget for it: a matched screen for a 100-inch laser TV is frequently a four-figure line item on its own.