When buyers ask about interactive whiteboards, brightness is one of the first numbers they look at.
“Is 400 enough?”
“Why does this one claim 700 or even 1000 nits?”
“Bigger screen, higher brightness—right?”
These questions come up again and again in real projects. And honestly, the confusion is understandable. In consumer TVs and outdoor LED screens, higher brightness often does mean better visibility. But interactive whiteboards are a very different product category.
In this article, we’ll break down how brightness really works in interactive whiteboards, why Qtenboard standardizes 400–500 nits depending on size, what hardware controls brightness, and why exaggerated brightness claims are common in the market.
This isn’t marketing theory. It’s engineering reality.
Brightness, measured in nits (cd/m²), describes how much light a display emits. In an interactive whiteboard, brightness affects:
But here’s the key point many buyers miss:
Interactive whiteboards are designed for indoor, long-hour use at close-to-medium viewing distances.
They are not outdoor signage. They are not showroom TVs. They are tools people stare at for hours.
That changes everything.
At Qtenboard, brightness is not chosen arbitrarily. It is matched carefully to screen size, panel characteristics, and real usage environments.
| Ekrano dydis | Standard Brightness | Typical Use Case |
|---|---|---|
| 55"–75" | 400 nits | Classrooms, meeting rooms |
| 86" | 450 nits | Medium to large rooms |
| 98" / 105" / 110" | 500 nits | Large classrooms, lecture halls |
These values are not conservative. They are deliberate engineering choices.
In classrooms and offices, users typically view the screen from 1.5–5 meters, often for several hours continuously.
Excessive brightness leads to:
That’s why most education-focused display standards recommend moderate brightness combined with good contrast, not extreme luminance.
Brightness is directly linked to backlight drive current.
Higher brightness means:
Pushing brightness too high may look impressive on day one—but it shortens panel life dramatically.
For interactive whiteboards expected to run 8–12 hours a day for years, this matters.
Brightness increases heat.
Heat affects:
Engineering for stable brightness is about thermal balance, not peak numbers.
Qtenboard is not alone in advocating this range.
Major commercial display and panel manufacturers consistently position 400–500 nits as the optimal zone for indoor professional displays.
This range is commonly adopted by:
Why? Because it balances:
In other words, it’s the result of industry-wide validation, not one factory’s opinion.
Brightness is not a single component. It’s a system outcome.
The backlight is the primary brightness source.
Key factors include:
At Qtenboard, backlight systems are selected and tuned for sustained output, not peak showroom brightness.
Stable brightness requires a stable power supply.
Poor power design leads to:
This is one area where cost-cutting is common—and dangerous.
Brightness and heat are inseparable.
Qtenboard designs:
All to ensure brightness remains consistent over long operation.
Not all panels behave the same at the same brightness level.
We focus on:
This is why “claimed brightness” and “usable brightness” are often very different things.
Brightness numbers on paper are easy. Delivering them reliably is not.
Qtenboard uses:
Every unit is reviewed not just for brightness level, but for brightness quality.
Before mass shipment, systems undergo:
This prevents early degradation after deployment.
Let’s address the elephant in the room.
High brightness claims usually come from:
In practice, these displays:
It’s a trade-off many buyers don’t see until months later.
| Environment | Recommended Brightness |
|---|---|
| Standard classroom | 400 nits |
| Conference room | 400–450 nits |
| Large lecture hall | 500 nits |
| Direct sunlight | Not recommended for IWB |
Brightness is not about winning a numbers game.
For interactive whiteboards, the real goal is comfortable visibility, long-term stability, and predictable performance. That’s why Qtenboard engineers brightness carefully by size, environment, and system design.
400–500 nits isn’t a limitation—it’s a professional standard refined through real-world use.
And that’s the difference between a display that looks good on day one, and one that performs reliably for years.
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