Which Banner Colours Actually Read at a Distance
Colour advice for signage is usually about feelings and never about sources. This is about luminance: which colours carry across a room on a dark field, and which fall apart.
Most colour advice for signage is about feelings, and it is written without sources. Red is urgent, blue is trustworthy, and nobody can show you the study.
The colours on a scrolling banner do something you can check instead: some of them stay readable across a room and some fall apart. That is worth knowing, because a banner nobody can read has no emotional effect either.
What follows is organised by how each colour behaves on a dark field, which is the pairing an LED banner almost always uses.
Yellow — the one that carries furthest
Reads from: the greatest distance of any common colour
Why: yellow is close to the brightest thing a screen can produce, so against black it has the largest luminance gap
Use for: anything that has to be read by someone moving past, outdoors, or in a bright room
Examples: queue numbers, hazard and caution wording, a price in a window, direction signs
Hazard signage settled on yellow and black long before screens existed, for exactly this reason.
White — nearly as far, and never wrong
Reads from: almost as far as yellow
Why: maximum luminance, and no hue for a screen or a camera to distort
Use for: the default when you have no reason to choose anything else
Examples: a name at arrivals, opening state, anything on a stream
If you are unsure, this is the answer. White on black fails less often than any other pairing.
Green — the classic look, mid-range reach
Reads from: a good distance, short of yellow
Why: bright, but not as bright as yellow or white
Use for: when you want the banner to look like a traditional LED sign, which it does more than any other colour
Examples: shop welcome, open state, the retro ticker look
Red — vivid up close, weak at distance
Reads from: less far than it appears to on your desk
Why: red is one of the darker colours a screen produces, so on black the luminance gap is small even though the hue is loud
Fails when: the viewer is far away, the room is bright, or the banner is going through video compression, where saturated red smears at low bitrates
Use for: short words, close up, where the alarm is the point
Examples: SALE, STOP, CLOSED — one or two words, not a sentence
Red on black is the most over-chosen pairing on any banner tool. It looks strongest on the screen in front of you and weakest from where your reader stands.
Blue — the one to avoid on black
Reads from: the shortest distance of the common choices
Why: blue is the darkest colour a screen produces, so against black there is very little to separate
Use for: a background, not the Text
Examples: white Text on a blue field works well; blue Text on a black field does not
Two rules that outrank any colour choice
Do not encode meaning in red versus green alone. Red-green colour blindness is the common kind, and a banner where the only difference between *open* and *closed* is the hue reads identically to a lot of people. Change the words too.
Check it from where the reader will be. Walk to the doorway, the pavement, the far side of the hall, and look. Every colour decision above is a rule of thumb, and the actual room beats all of them.
What this page does not claim
That any colour makes people buy more, trust you more, or feel a particular way. Those claims exist everywhere and none of them come with evidence you could check. What is above is about light and distance, which you can test yourself in a minute.