AV Guides · 4 min read
How Many Lumens Does Your Projector Need?
Lumens are about the room, not the projector. Match brightness to ambient light and screen size.
What a lumen actually tells you
Lumens measure how much light the projector throws. The bigger your screen and the brighter your room, the more lumens you need to keep the image looking solid rather than grey.
Two things eat brightness fast: ambient light, and screen size. Doubling the screen area roughly halves the perceived brightness, so a projector that looked great on a 100" screen can look flat on a 200" one.
Brightness by situation
| Situation | Recommended | Screen size |
|---|---|---|
| Dark home theatre or blackout room | 3,000 lumens | Up to 120" |
| Meeting room with blinds drawn | 3,000–5,000 lumens | 100"–150" |
| Hotel function room, lights partially on | 5,000–7,000 lumens | 150"–200" |
| Ballroom, atrium, or bright hall | 7,000–10,000 lumens | 200"–300" |
| Outdoor after dark | 7,000+ lumens | 150"–300" |
| Outdoor in daylight | Use an LED wall instead | — |
Things people get wrong
- ▸Assuming a bigger screen fixes a dim image — it makes it worse.
- ▸Comparing lumens across brands without checking whether the figure is ANSI-rated.
- ▸Forgetting the house lights: if staff need light to serve food, plan for it.
- ▸Using a white wall instead of a screen — you lose contrast and gain texture.
The short version
For most Singapore corporate events in a hotel function room, 5,000 to 7,000 lumens on a 150" to 200" fast-fold screen is the safe middle. Go higher if the room cannot be dimmed at all.
Want a second opinion on your setup?
Send us the venue, headcount, and date — we will tell you exactly what the room needs.