"How many lumens do I need?" is the single most common projector question we get from golf simulator builders. The answer depends on your room, your screen, and how much ambient light you're dealing with. Here's a straightforward guide based on thousands of projectors we've sold.
The Short Answer
For a dedicated sim room with controlled lighting (blackout curtains, no windows, overhead lights off during use): 3,000-3,500 lumens is plenty. This covers most home builds.
For a room with some ambient light (garage with windows, basement with walkout, room with lights partially on): 4,000+ lumens will keep the image vivid.
For a commercial venue or brightly lit space (overhead fluorescents, large windows, high foot traffic): 5,000-9,800 lumens from the Optoma ProScene lineup.
Lumens by Room Type
| Room Type | Recommended Lumens | Example Models |
|---|---|---|
| Dedicated dark sim room | 2,800 - 3,500 | BenQ AW30ST, Optoma GT2000HDR |
| Basement with some ambient light | 3,500 - 4,000 | Optoma ZW350ST, BenQ AH500ST |
| Garage with windows | 4,000+ | BenQ AK700ST, BenQ LK830ST |
| Multi-purpose room (lights on) | 4,000 - 5,000 | BenQ LK936ST, Optoma ZU507TST |
| Commercial venue / teaching studio | 5,000 - 8,500 | Optoma ZU607TST, Optoma ZK810TST |
| Large venue / 200"+ screen | 8,000 - 9,800 | Optoma ZU820TST, Optoma ZU920TST |
ANSI Lumens vs Rated Lumens
Watch out for this: some manufacturers list rated lumens (their own measurement) while others list ANSI lumens (standardized industry measurement). ANSI lumens are typically 15-25% lower than rated lumens for the same projector.
For example, the Optoma ZU920TST is rated at 9,800 lumens but measures 8,200 ANSI lumens. Both numbers are "correct" — just different standards. When comparing projectors, make sure you're comparing the same measurement type.
Does Screen Size Affect How Many Lumens You Need?
Yes. A larger screen spreads the same light over a bigger area, so the image appears dimmer. A projector that looks brilliant on a 100-inch screen will look washed out on a 200-inch screen.
Rule of thumb: For every 30% increase in screen area, add about 1,000 lumens to maintain the same perceived brightness. If 3,500 lumens looks great on your 100-inch screen, you'd want about 4,500 lumens for a 130-inch screen in the same room.
Laser vs Lamp: Brightness Over Time
This is where light source matters beyond just the spec sheet:
- Laser projectors maintain close to their rated brightness for the entire 20,000-30,000 hour lifespan. A 3,500-lumen laser projector will still be around 3,200 lumens after 10,000 hours.
- Lamp projectors lose 20-30% of their brightness within the first 2,000 hours. A 4,000-lumen lamp projector might output only 2,800 lumens by the time you replace the bulb.
This means a 3,500-lumen laser projector often outperforms a 4,000-lumen lamp projector in real-world use after the first year. Read our Laser vs Lamp vs LED comparison for the full breakdown.
Our Brightness Recommendations by Budget
- Under $1,200: The Optoma GT2000HDR at 3,500 lumens laser is the best value. Bright enough for any dedicated sim room.
- $1,500-$2,500: The BenQ LK830ST at 4,000 lumens 4K laser handles ambient light well.
- $3,000-$5,000: The BenQ LK936ST at 5,100 lumens is the brightest home-class 4K projector.
- $5,000+: The Optoma ProScene lineup goes up to 9,800 lumens for commercial installations.
Still Not Sure?
Call us at 1-888-871-6110. Tell us your room dimensions, ceiling height, screen size, and whether you have windows or ambient light. We'll recommend the right brightness level for your specific setup.
