400W LED High Bay Light
Above 12 m, ordinary high bays run out of reach: the 400W class exists for automated high-bay stores, steel and heavy-industry halls, hangars, and indoor arenas where light must arrive at the floor from 12–20 m with enough intensity left to meet industrial targets. Fixture count drops, but each fixture works harder — making thermal design and beam choice the whole specification.
Two SJGK housings are built for this duty: the riveted-fin SJGK903 with electroplated corrosion resistance, and the modular-fin SJGK905 — a 650 mm platform engineered for stadium, ballpark and mining-hall applications. Both ship with the IES/LDT files the photometric layout needs.
Where 400W Fits
Guidance for the high-power band — always confirmed by a DIALux study at these heights.
12–20 m: automated stores, heavy-industry halls, hangars, arena roofs. The narrow-beam variant is the default at the top of the band.
At 15 m, a 60° beam covers ~17 m diameter; a 90° beam ~30 m but far thinner. Mixing narrow aisles-beams with wider fill is standard at height.
Automated high-bay warehouses, foundries and steel halls, aircraft hangars, indoor sports arenas, mining process buildings.
Roof-space ambient at 15 m in summer decides fixture life. Check the Ta rating against your real roof-void temperature, not the outdoor average.
SJGK Housings Available at 400W
| Series | Design Highlight | Dimensions (⌀ × H) | |
|---|---|---|---|
 | SJGK903 | Riveted-fin cooling, electroplated corrosion resistance | φ375 × 419 |
 | SJGK905 | Modular fin system — stadium, ballpark & mining class | φ650 × 230 |
Dimensions in mm from the factory catalog. All housings: aluminum body, IP65. Full datasheet and IES/LDT files on request.
Where This Class Works
Three duties this wattage is specified for most often — and what changes in the specification for each.
Heavy-industry and crane halls
Above 12 m, fixture count drops and each unit works harder — which makes thermal design and beam choice the whole specification. Roof-space ambient in summer, not the outdoor average, is what decides real fixture life at this height.
- 12–20 m mounting height band
- Check Ta rating against roof-void temperature
- Heavy fin area for continuous duty
Indoor arenas and large sports halls
Arena roofs combine height with glare rules: players and spectators look up. The modular-fin platform is specified for indoor court and ballpark duty, designed against the EN 12193 class the venue must hold.
- Designed to the EN 12193 class
- Beam mix for height and uniformity
- Flicker data for broadcast and slow-motion
Process buildings and mining halls
Process plants and mineral handling buildings need output from height in atmospheres that clog and corrode. Sealed construction and corrosion-resistant finishes are what keep the delivered lux from decaying within a year.
- Sealed against process dust
- Electroplated corrosion resistance available
- Serviceable driver for long-life installations
How It Goes Up
The mounting methods this fixture class is supplied for. Installation photographs from delivered projects are being catalogued and will be added alongside.
Every Order Ships With the Paperwork
The documents an engineer needs to verify the design and an importer needs to clear customs — supplied as standard, not on request.
IES / LDT files for the exact housing and optic quoted, so your designer models the fixture you are buying.
A free DIALux study from your dimensions — lux, uniformity and fixture count verified before you commit.
CE / FCC / CCC documentation with the type-test reports behind it, plus the Ex certificate where applicable.
Driver spares quoted with the order and an engineer contact who answers after the invoice is paid.
Straight Answers to the Questions Buyers Ask in Forums
What buyers report in sourcing forums and marketplace reviews — and how to check any supplier, including us.
Every intervention at height is a lift hire and a stopped line. That makes L70 life and driver quality the real specification — ask for the LM-80/TM-21 basis behind any lifetime claim, and confirm replacement drivers are stocked for the years ahead.
A wide-beam fixture at 15 m paints the floor thin and glares from every angle. The photometric layout mixes narrow aisle beams with wider fill — if a supplier quotes wattage without asking your height, they are guessing with your money.
The chip's junction temperature — set by the heat sink, not the datasheet — drives lumen depreciation. Heavy fin area and honest Ta ratings are what 12–20 m duty demands; suspiciously light fixtures run suspiciously hot.
At this class, a free DIALux study from your hall dimensions is standard professional practice — fixture counts, aiming, uniformity, all verified. We prepare it from your floor plan; treat any supplier who will not as a red flag.
400W LED High Bay Light — Answered
What ceiling height needs a 400W LED high bay?
From about 12 m upward. Between 9–12 m, 200–300W with the right optic is usually more economical; the 400W class earns its place where automated stores, industrial halls and arenas mount at 12–20 m and lower wattages simply cannot deliver floor-level targets.
What does a 400W LED high bay replace?
The traditional 1000W metal halide high bay — at less than half the load. In arena and hall retrofits the LED swap also removes the restrike delay that made HID unusable after power dips.
Can these light indoor sports halls?
Yes — SJGK905's modular-fin platform is specified for indoor courts, ballparks and arena duty, where EN 12193 classes set the lux and uniformity targets. Send the hall dimensions and class and we return the photometric design with fixture counts.
How does 400W compare with using more 200W fixtures?
It is a genuine design choice: more 200W units give finer uniformity control at lower heights, fewer 400W units cut installation points at height. The DIALux comparison for your geometry settles it — we prepare both options on request.
Send Us the Space, Not Just the Wattage
Share the dimensions, mounting height and the level you need to hold. Our engineers return a lighting layout with fixture count, aiming and the photometric files behind it — before you commit to anything.
Floor plan or site dimensions, mounting height, target lux or the standard you must meet.
A DIALux study with fixture count, layout, aiming and IES files — at no cost.
Your engineer checks the numbers against the standard. Only then does a quotation matter.
Manufacturing in Changzhou since 1999 · Shipping to 50+ countries · CE / FCC / CCC
Tell us about your project.
Get a quote within 24 hours.
Share your application — environment, requirements, quantity. A real engineer responds with a tailored quote, IES files, and timeline within one business day.