On November 1, 2026, a new mandatory Chinese national standard quietly changes how every classroom in the country is lit — and a lot of parents are about to misread it.
It's called GB 7793—2025, the Hygienic Standard for Daylighting and Lighting in Primary and Secondary School Classrooms. It is a mandatory standard. Schools have to comply. And almost immediately a familiar question shows up in comment sections everywhere: "So should I swap my kid's desk lamp for something that matches these numbers?"
Short answer: no — because this standard doesn't cover your home at all.
What the standard actually covers (and what it doesn't)
GB 7793—2025 applies to teaching rooms: classrooms, labs, and art rooms in primary and secondary schools, including vocational schools. Off-campus training centers are expected to follow it too.
Your living room, your kid's bedroom, and the lamp sitting on the homework desk are not in scope. That's the most common mistake parents make: they read a classroom standard and try to apply it to a desk lamp.
Household reading lamps have their own standard, and it's a recommended one, not mandatory: GB/T 9473—2022. Crucially, the two documents use different numbers. Even the same metric means something different in each.
The counter-intuitive part: 300 lx vs 500 lx
Here's the number that trips everyone up. Under the classroom standard, the desk surface only needs ≥300 lx. But under the desk-lamp standard, the AA-grade center zone needs ≥500 lx.
Why would a desk lamp need more light than a whole classroom desk?
Because you're comparing two different things. The classroom figure describes ambient light across an entire room — many fixtures, working together, over a wide area. The lamp figure describes a small, close-range working surface — a 50×30 cm patch right in front of the child. Same unit (lux), completely different jobs.
| Metric | Classroom — GB 7793—2025 (mandatory) | Desk lamp — GB/T 9473—2022 (recommended) |
|---|---|---|
| Desk / center-zone illuminance | ≥300 lx | AA-grade center zone (50×30 cm) ≥500 lx |
| Uniformity | ≥0.7 | Total area ≥250 lx; uniformity ≤3 (total area ≤7) |
| Board illuminance | ≥500 lx (uniformity ≥0.8) | — |
| Max horizontal illuminance | — | ≤2500 lx |
| Color temperature | 3300–5300K | ~4000K (color tolerance ≤5) |
| Color rendering | Ra≥80 (LED R9>0) | Ra≥80 (professional Ra≥95, R9>0) |
| Blue light | RG0 (board RG0 or RG1) | RG0 or RG1 (choose RG0 for children) |
| Glare / flicker | UGR≤16; no bare light source; emission surface ≥1.7m from the desk; new limits on fluctuation depth, flicker index, and stroboscopic effect visibility | Flicker frequency ≥3125Hz, no visible flicker; 3C certification as the compliance baseline |
So the classroom rules and the desk-lamp rules are two separate rulebooks. Mixing them up is exactly how parents end up buying the wrong thing.
4 checks you can do at home, no instruments
- Point your phone camera at the light-emitting surface. Look for rolling stripes or banding on the screen. That's a rough flicker check — just a first-pass screen, not a lab measurement.
- Read the blue-light grade on the nameplate. Look for RG0. For children, RG0 is the target.
- Check Ra and R9. Ra tells you overall color rendering; R9 tells you how reds reproduce. Both matter for paper and print.
- Set color temperature around 4000K, and place the lamp correctly. Put it on the opposite side of the writing hand — a right-handed child gets the lamp at the front-left — and switch the ceiling light on at the same time. One lamp alone creates a big bright-dark contrast, and the pupil keeps adjusting; a ceiling light plus a desk lamp together is the better setup, keeping the desk around 300 lx.
Why the driver power supply decides the most
Notice where the hard requirements keep landing: flicker limits, blue-light grade, color temperature, color consistency. Those aren't really decided by the LED chip. The chip sets the color of the light. The driver power supply decides whether that light is stable and clean — whether flicker is suppressed, whether the spectrum stays within its blue-light class, and whether color consistency holds across units and over time.
This is the part buyers rarely see, because it's inside the housing. But it's the part that determines whether a lamp actually meets the numbers on paper — or only in the spec sheet.
If you build or source lighting, that's where the real engineering lives. At Nexlamp we make LED driver power supplies, and every flicker, blue-hazard, and color-consistency requirement in these two standards is a driver problem before it is anything else.
When the classroom standard lands on November 1, 2026, the numbers will be easy to quote. Making hardware that genuinely holds them is the harder part.
Originally published on the NEXLAMP blog.
Top comments (0)