How can manufacturers upgrade blackboard luminaires to comply with the new national standard GB7793-2025?

2025-12-13 · Technical Q&A

Great, "product upgrade" happens to hit the core change points of GB 7793-2025. I. Upgrade objective: Make blackboard lighting fixtures "naturally satisfy" "ordinary classrooms using multimedia teaching

Quick Answer

Blackboard lighting fixtures must comply with GB 7793-2025. The core requirement is that each luminaire must have independent dimming or independent illuminance reduction; a row of lights cannot share a single dimmer. Two-step illuminance reduction of 100%/≤50% or continuous dimming from 1–100% is recommended, along with local wall control, and the dimming process must be free of visible flicker.

Great,The "product upgrade" happens to hit the core change points of GB 7793-2025.

I. Upgrade objectives

Make blackboard lighting fixtures "naturally comply with"
"In ordinary classrooms using multimedia teaching, each blackboard lighting fixture shall be equipped with an independent dimming or illuminance-reduction control device"

II. The 5 "hard indicators" of the product upgrade (must be achieved)

① Each fixture ≠ each row of fixtures (this is the lifeline)

Upgrade requirements:

Each blackboard fixture:
- Independent dimming
- Or independent illuminance reduction

Acceptable approaches:

Single-fixture built-in dimming driver
Single-fixture independent circuit
Single-lamp addressable control

Not recommended / risky:

One row of lights shares a single dimming channel
The left and right lamps are always synchronized and cannot be separated

👉 At minimum, ensure: left / right writing board lights can be dimmed independently

② The dimming "form" is not mandatory, but the "effect" must be obvious

The standard keywords are:

"dimming or reducing illuminance"

Three recommended reliable solutions (from easy to advanced)

Solution	Description	Acceptance risk
Two-level illuminance reduction	100% / ≤50%	⭐ Lowest
Three-level dimming	100% / 70% / 30%	⭐⭐
Continuous dimming	1–100%	⭐⭐⭐ (Best)

👉 The key point is not showing off, but "being able to visibly dim"

③ Dimming must be "controllable on site" (not via backend)

Strongly recommend upgrading to:

Wall-mounted dimming panel
or
Wall-mounted independent buttons (High / Low)

Not recommended to claim separately:

Can only be adjusted via backend system
Can only use APP (easily questioned during acceptance)

👉 The question experts love to ask most:
"Can the teacher adjust it directly while standing at the podium?"

④ Dimming must be "flicker-free" (this is the hidden minefield of 2025)

When upgrading, must simultaneously changeDriver power supply:

Minimum requirement recommendation:

Above visible flicker frequency
Or constant current + high-quality dimming solution

Usable wording for product copy:

"No visible flicker during dimming"
"Complies with classroom healthy light environment requirements"

👉 Otherwise:
Dimmed the light, flicker exceeds standard = upgrade failed

⑤ Default "multimedia mode" is a bonus (not mandatory, but very worthwhile)

Recommended product logic:

Power-on defaults to 100%
One-touch switching:
- ▶ Blackboard mode
- ▶ Projection mode (automatic illuminance reduction)

This is very popular in reviews, but not mandatory.

III. Product structure upgrade recommendations (engineering-executable)

🔧 Option A | Traditional and reliable type (high cost-effectiveness)

Writing board lights ×2 (or more)
Each light independently driven
Two-level wall control (high / low)
Independent circuit

👉 Easiest to pass acceptance

🔧 Option B | Mainstream upgrade type (recommended)

Single-lamp stepless dimming driver
Knob / touch panel
Independent addresses for left and right lights
One-touch illuminance reduction in projection mode

👉 Both standard response and user experience are good

🔧 Solution C | Smart Advanced Type (High-end)

Single-lamp addressing
Dual control via local panel + smart system
Scene memory
Usable when network is down

👉 Note:
Be sure to retain "local control"

IV. After the upgrade, you can legally and confidently promote it this way

✅ One-sentence product selling point

Blackboard lighting fixtures supportindependent dimming/illuminance reduction control per lamp, suitable for multimedia teaching scenarios, and compliant with the new GB 7793-2025 standard requirements.

✅ Technical parameters can be stated as

Dimming method: independent dimming per lamp / illuminance reduction control
Control method: local panel control
Applicable standard: GB 7793-2025 (blackboard lighting clauses)

V. The 6 most common pitfalls in upgrades (must avoid)

❌ "One dimming for a whole row of lights"
❌ Only on/off
❌ Obvious flicker after dimming
❌ No wall control
❌ Reliance on a backend system
❌ Can be claimed, but cannot be delivered on site

Frequently Asked Questions

What exactly does the new national standard GB 7793-2025 require for blackboard light dimming?

It requires that each blackboard lighting luminaire have an independent dimming or illuminance-reduction control device, rather than a row of lights sharing one dimmer. Acceptable options include a built-in dimming driver in each luminaire, an independent circuit per luminaire, or per-luminaire addressable control, with at least the left/right blackboard lights capable of independent dimming.

To what extent must blackboard light dimming be implemented to pass acceptance?

The key phrase in the standard is "dimming or illuminance reduction." The point is not visual flair but the ability to noticeably dim. Recommended options are two-step illuminance reduction of 100%/≤50%, three-step 100%/70%/30%, or continuous dimming from 1–100%, with continuous dimming being the best, and there must be no visible flicker after dimming.

Must classroom blackboard light dimming be controllable on the wall?

It is strongly recommended to upgrade to a wall-mounted dimming panel or independent wall switches (high/low). It is not advisable to rely solely on back-end system control or APP-only operation. Acceptance experts often ask, "Can the teacher adjust the light directly while standing at the podium?" Local panel control is the most reliable option.

Does flickering after dimming the blackboard light count as an upgrade failure?

Yes. Dimming must be free of visible flicker—this is a hidden pitfall in 2025. When upgrading, the driver power supply must be updated simultaneously. It is recommended to exceed the visible flicker frequency or adopt a constant-current plus high-quality dimming solution. Product copy can state: "No visible flicker during the dimming process."

After upgrading the blackboard light, how should product selling points and specifications be written?

You can write: Supports independent dimming per fixture / illuminance reduction control, suitable for multimedia teaching scenarios, compliant with GB 7793-2025 new standard requirements. Technical specifications can state the dimming method as independent dimming per fixture / illuminance reduction control, the control method as local panel control, and the applicable standard as GB 7793-2025 (blackboard lighting clauses).