First, translate this sentence into what industry people can understand
In ordinary classrooms that use multimedia teaching, each blackboard lighting fixture shall have an independent dimming or illuminance reduction control device.
Equivalent to:
👉 As long as the classroom uses multimedia (projectors, electronic whiteboards, etc.)
👉 Blackboard lights are not optional, but rather:
- Each one
- Must
- Be capable of being dimmed or brightened individually (or at least reduce illuminance)
This is no longer a recommendation, but aClear functional requirement.
Second, break it down item by item (this is what reviewers and inspectors focus on most)
① Ordinary classrooms that use multimedia teaching
- Not just multimedia classrooms
- Now more than 90% of ordinary classrooms qualify
👉 The scope of application is very broad, almost full coverage
② "each blackboard lighting luminaire"
This sentenceis very tough, note that it is:
- ❌ not "each group"
- ❌ not "overall one-button control"
- ✅ it iseach individual luminaire
meaning:
- the left and right blackboard luminaires
- or multiple linear blackboard luminaires
👉 must all have independent adjustment capability
③ "independent dimming or illuminance reduction control device"
There are 3 key points here:
✅ 1️⃣ "Independent"
- ❌ Adjusted together with the classroom lights →Does not count
- ❌ Indivisible from the entire row of blackboard lights →Risky
- ✅ At minimumThe writing board system is independent of the ambient lighting
✅ 2️⃣ "Dimming or reducing illuminance"
StandardDeliberately written very broadly, giving manufacturers and schools room:
- ✔ Continuous dimming (knob / panel / smart)
- ✔ Step dimming (100% / 70% / 30%)
- ✔ Switching to "low illuminance mode"
👉 Does not require stepless dimming
👉 But it must be able to "significantly reduce brightness"
✅ 3️⃣ "Control device"
Note:
What is emphasized here is"device", not a software concept.
Generally recognized ones include:
- Wall-mounted dimming panel
- Independent button
- Independent circuit
- Intelligent control terminal (provided that on-site operation is possible)
❌ Only a backend system, with no on-site operable entry point →High acceptance risk
III. Compared with the 2010 version, where are the changes in this statement?
Item GB 7793-2010 GB 7793-2025 Whether dimming is mentioned ❌ Not at all ✅ Explicitly proposed Blackboard light control No requirement Independent dimming/illuminance reduction per luminaire Multimedia scene Not considered Dedicated separately listed scene Degree of mandatoriness Functional scene Function + control function
👉 This is an upgrade from "lighting metrics" to "teaching behavior adaptation"
IV. Why does the standard add this sentence? (The real logic)
There is only one reason:
👉 During projection, if the blackboard light is too bright = glare + can't see clearly + eye damage
Common problems in the past:
- As soon as the projector turns on, the blackboard light is glaring
- Teachers can only "turn off the entire row of lights"
- Front rows are dark, back rows are bright, visual experience is extremely poor
This sentence was written specifically to solve this problem.
V. In proposals / bids / products, you can "standardize" the wording like this
✅ Technical response (highly recommended)
For regular classrooms using multimedia teaching, each blackboard lighting fixture in this solution is equipped with an independent dimming or illuminance-reduction control device, which can flexibly adjust brightness according to teaching scenarios such as projection and blackboard writing, complying with the relevant requirements of GB 7793-2025.
✅ Product description (won't be questioned)
Blackboard lighting fixtures support independent dimming/illuminance-reduction control per individual luminaire, meeting the needs for brightness adjustment and anti-glare performance in multimedia teaching scenarios.
VI. Here's an "acceptance pitfall avoidance reminder" for you (very important)
Under GB 7793-2025,Situations easily rejected:
❌ All blackboard lights share one switch
❌ Only "all on / all off"
❌ Only adjustable in the backend system, no on-site operation
❌ Saying "dimming can be achieved by replacing the luminaire" (not accepted)
More reliable approaches:
✅ Independent circuit for writing board lights
✅ Single luminaire or single side adjustable
✅ Clear dimming / illuminance reduction control on the wall