Last updated: 11 September 2026 · Written for lighting distributors, contractors and specifiers working to EN 12464-1
Direct lighting sends 90–100% of a luminaire’s light straight down onto the task; indirect lighting sends 90–100% upward, so the light reaches the task only after reflecting off the ceiling and walls. Direct lighting is the more efficient way to put lux on a desk. Indirect lighting gives a brighter-looking room with softer shadows and less glare. Most modern offices use a combination of the two, called direct-indirect (up/down) lighting.
This guide defines each distribution using the CIE luminaire classification. It gives real commercial examples of each one and compares them on glare (UGR), efficiency, wall and ceiling brightness and ceiling height. It then shows what EN 12464-1:2021 requires on walls and ceilings in offices, which is why the choice matters on a specified European project. The last section maps each distribution to the luminaires distributors and contractors actually order.
What Is Direct Lighting?
Direct lighting is a light distribution in which 90–100% of a luminaire’s luminous flux is emitted downward, below the horizontal plane, onto the working plane. In the CIE classification of luminaires, it is the class with the least upward light. Because the light does not have to reflect off a room surface first, almost none of it is lost on the way to the desk. That makes direct lighting the most efficient way to reach a target illuminance such as 500 lx on an office desk.
The trade-off is what happens above the luminaire. A fitting with no upward light leaves the ceiling lit only by light reflected back from the floor and furniture. In a room with dark finishes, this produces the “cave effect”: a well-lit desk under a dim ceiling. Direct luminaires also show a bright surface in the field of view, so they depend on their optics to control glare. The glare is expressed as a UGR value.
Direct Lighting Examples in Commercial Buildings
These are typical examples of direct lighting on UK and German projects:
- Recessed LED panels in a CAT A office fit-out. 600 × 600 mm modular luminaires, or 625 × 625 mm in German grid ceilings, deliver all of their light downward.
- Low-glare modular or louvre luminaires in CAD and technical drawing rooms. These rooms are commonly specified at UGR 16, where screen reflections must be kept to a minimum.
- Recessed linear luminaires in school corridors and hospital circulation routes. These give continuous lines of downward light at a low mounting height.
- Track spotlights in retail. These are narrow-beam direct light that picks out merchandise on shelves and mannequins.
- High-bay luminaires in warehouses. In a high, open space, downward light is the only practical way to reach the floor.
Advantages and Disadvantages of Direct Lighting
| Advantages | Disadvantages |
|---|---|
| Highest utilization. Most emitted lumens land on the working plane, so fewer watts per m² are needed for the same task lux. | The ceiling and upper walls can fall below the EN 12464-1 minimums unless the finishes are very light. |
| Works at any ceiling height, including 2.5–2.7 m UK office grids where nothing can be suspended. | A bright luminaire face is in view, so glare depends entirely on the optic (lens, louvre or microprismatic diffuser). |
| Precise control. Beam angles from narrow accent to wide ambient. | Harder shadows and weaker modeling on faces, which shows on video calls in meeting rooms. |
| Recessed versions keep the ceiling plane clean and are easy to replace within a grid. | A low ceiling with only direct light can make a deep-plan floor feel enclosed. |
If direct light is so efficient, why do so many specified offices still add an upward component? The answer is in how the rest of the room is lit, which is what indirect lighting controls.
What Is Indirect Lighting?
Indirect lighting is a light distribution in which 90–100% of a luminaire’s luminous flux is emitted upward, so it reaches the task only after reflecting off the ceiling and upper walls. In effect, the ceiling becomes a large, low-luminance secondary light source. The light arrives from many directions at once. Shadows are soft, reflections in screens are weak, and the room reads as bright and open.
The price is efficiency. Every reflection absorbs part of the light, and the ceiling’s reflectance sets the ceiling on performance. EN 12464-1:2021 recommends a ceiling reflectance of 0.7 to 0.9 and a wall reflectance of 0.5 to 0.8. An indirect scheme under a dark exposed soffit therefore loses much of its output before it reaches the desk.
Indirect Lighting Examples in Commercial Buildings
- Cove lighting in hotel receptions and boardrooms. Concealed linear LED lights the ceiling as a single glowing plane.
- Floor-standing uplighters in listed or heritage offices. These are used where the ceiling cannot be touched, a common constraint in London and Berlin refurbishments.
- Uplight pendants under vaulted or exposed concrete ceilings in lecture halls and libraries. This works only where the soffit is painted light.
- Upward light over hospital beds. A patient lying on their back looks straight at the ceiling, so the ambient light over the bed is kept indirect.
- Luminous ceilings and backlit stretch ceilings in retail and showrooms. The entire ceiling surface becomes the light source.
Advantages and Disadvantages of Indirect Lighting
| Advantages | Disadvantages |
|---|---|
| Very low direct glare. The light source itself is out of sight. | Lower utilization. More installed lumens are needed to reach the same task lux. |
| Bright ceiling and upper walls, so the room looks larger and more open. | Needs ceiling height for the suspension drop, plus a light-coloured ceiling. |
| Soft, multi-directional light that is good for faces and for screens. | Flat and “shadowless” on its own. Objects and surfaces lose texture. |
| Hides the fitting, which suits hospitality and heritage interiors. | Dust on the upper face of an uplight cuts output, so cleaning needs to be planned. |
The Five CIE Light Distribution Classes
“Direct” and “indirect” are the two ends of a scale. The CIE classification splits luminaires into five classes by the share of their light that goes downward versus upward. Every luminaire’s LDT photometric file shows which class it belongs to.
| CIE class | Downward light | Upward light | Typical luminaire | Where it is used |
|---|---|---|---|---|
| Direct | 90–100% | 0–10% | Recessed panel, recessed linear, downlight, spotlight | Offices with grid ceilings, corridors, retail accents, warehouses |
| Semi-direct | 60–90% | 10–40% | Suspended linear with a small uplight component | Open-plan offices, classrooms |
| General diffuse / direct-indirect | 40–60% | 40–60% | Up/down suspended linear, opal pendant | Open-plan offices, meeting rooms, libraries |
| Semi-indirect | 10–40% | 60–90% | Uplight-dominant pendant or floor lamp | Receptions, breakout areas |
| Indirect | 0–10% | 90–100% | Cove, uplighter, luminous ceiling | Hospitality, heritage interiors, patient rooms |
What Is Direct-Indirect (Up/Down) Lighting?
Direct-indirect lighting is a distribution in which a single luminaire emits light both downward onto the task and upward onto the ceiling. It is usually a suspended linear profile with two separate optics. The downward component carries the task illuminance and is controlled for glare. The upward component lifts the ceiling and walls and fills in shadows. The result keeps most of the efficiency of direct lighting without the cave effect.
This is why suspended up/down linear light has become the default in open-plan offices across the UK, Germany and the Netherlands. A single row over each bank of desks can deliver 500 lx on the desk. The same row meets the wall and ceiling targets of EN 12464-1 and keeps UGR at or below 19 for screen work. The mechanics of choosing between suspended, surface and recessed runs are covered in our guide to selecting linear fixtures for commercial ceilings.
Direct vs Indirect Lighting: Side-by-Side Comparison
| Attribute | Direct | Direct-indirect | Indirect |
|---|---|---|---|
| Light path to the task | Straight from the luminaire | Mostly straight, part reflected | Reflected off the ceiling and walls |
| Utilization (share of lumens reaching the working plane) | Highest | High | Lowest; depends on ceiling reflectance |
| Direct glare (UGR) | Controlled by the optic; UGR 16–19 achievable | Controlled on the downward optic | Very low; source hidden |
| Ceiling and upper-wall brightness | Low unless finishes are very light | Good | Very high |
| Vertical and cylindrical illuminance (faces, shelves) | Weaker | Good | Good but flat |
| Shadows and modeling | Hard, pronounced | Balanced | Very soft, little texture |
| Perceived spaciousness | Lower | High | Highest |
| Ceiling height requirement | None; can be recessed | Room for a suspension drop | Room for a suspension drop, light ceiling |
| Screen reflections | Depends on luminaire luminance | Low | Low, if the ceiling has no hot spots |
| Maintenance | Easy; closed optic faces down | Upper face collects dust | Upper face collects dust |
The table shows why “which is better?” has no single answer. On a specified project, the answer comes from the lighting standard the scheme must pass.
What EN 12464-1:2021 Requires on Walls, Ceilings and Faces
EN 12464-1:2021 sets minimum mean illuminances for walls and ceilings as well as for the task, so the brightness of the room is now part of compliance. The 2021 revision moved these wall, ceiling and cylindrical illuminance requirements into the application tables for each room type. A scheme that hits 500 lx on the desk but leaves a dark ceiling can therefore fail.
| Requirement (offices: writing, typing, reading, data processing) | EN 12464-1:2021 value | Which distribution helps |
|---|---|---|
| Maintained illuminance on the task (Ēm) | 500 lx | Direct component |
| Task uniformity (U₀) | ≥ 0.60 | Direct or direct-indirect rows |
| Unified glare rating limit (UGRL) | ≤ 19 | Low-luminance downward optic |
| Color rendering (Ra) | ≥ 80 | Any |
| Mean illuminance on walls (Ēm,wall) | 150 lx | Indirect or wide direct component |
| Mean illuminance on the ceiling (Ēm,ceiling) | 100 lx | Indirect component |
| Uniformity on walls and ceiling | U₀ ≥ 0.10 | Indirect component |
| Mean cylindrical illuminance (Ēz) | 50–150 lx, depending on the activity | Direct-indirect |
Treat the 150 lx on walls and 100 lx on ceilings as minimums, not targets. UK guidance such as SLL Lighting Guide 7 describes them as starting points for a well-balanced office. Cylindrical illuminance measures how much light falls on vertical surfaces from every direction, such as a colleague’s face across a meeting table or a person on a video call. Purely direct recessed panels are weakest on exactly these three rows (walls, ceiling and faces). Up/down luminaires are strongest on them. For the full room-by-room values, see our EN 12464-1 office lighting design values.
Which Is Better for Offices, Schools, Hospitals and Retail?
Direct-indirect is the better choice where people sit for long periods and communicate. Direct is the better choice where the ceiling is low, the grid is fixed, or the task needs precise, high-contrast light. Indirect works best as a supporting layer or in hospitality and patient spaces.
| Space (European project) | Recommended distribution | Why |
|---|---|---|
| Open-plan office, London or Frankfurt | Suspended direct-indirect linear | 500 lx on desks, UGR ≤ 19, and the wall and ceiling minimums met from a single row |
| CAT A office with a 600 × 600 or 625 × 625 grid | Recessed direct panel or modular luminaire | No suspension drop available; choose a UGR < 16 optic and light finishes |
| CAD and technical drawing rooms | Direct, low-glare (UGR 16) | 750 lx and minimal screen reflections |
| Meeting and video-conference rooms | Direct-indirect, dimmable (DALI-2) | Cylindrical illuminance on faces; soft modeling on camera |
| School classrooms | Direct-indirect, or a direct low-glare optic with a light ceiling | Pupils look up at the board and down at desks; see classroom lighting to EN 12464-1 |
| Hospital wards | Indirect over the bed plus direct examination light | Patients lying on their backs look straight at the ceiling |
| Retail floor | Direct ambient plus direct accent on track | Contrast sells merchandise; indirect is used for ceiling features |
| Corridors and circulation areas | Direct recessed linear | 100 lx, UGR ≤ 28, U₀ ≥ 0.40; efficiency matters most |
Five Common Misconceptions, Corrected
“Recessed ceiling lights give both direct and indirect light”
They do not. A recessed luminaire sits flush in the ceiling and cannot send light upward, so it is always a direct luminaire. Some light reflects back off the floor, but that is the room’s inter-reflection, not an indirect component. To get upward light you need a suspended, wall-mounted or free-standing luminaire.
“An indirect optic makes it an indirect luminaire”
Not necessarily. Some low-glare luminaires bounce the LED light off an internal reflector before it leaves the fitting. The CC Series louvre luminaire, for example, uses a mirror-aluminium louvre and an indirect reflective optical path. The light still exits downward, so its distribution is direct. The internal reflection reduces the luminance you see, which lowers glare, but the ceiling is not lit.
“Direct lighting always uses less energy”
Direct light has the higher utilization, but installed load depends on three things together: luminaire efficacy in lm/W, utilization, and controls. A 140 lm/W up/down luminaire under a white ceiling, dimmed by DALI-2 daylight and presence sensing, can use less energy over a year than a basic direct panel running at full output. Compare schemes in W/m² and kWh per year from a DIALux calculation, not by distribution type.
“Indirect lighting is automatically glare-free”
Indirect lighting removes direct glare from the source, but a luminaire hung too close to the ceiling creates bright stripes that reflect in screens. Suspension distance is part of the design. Linear pendants typically hang 300–800 mm below the soffit so the uplight spreads evenly.
“LED fittings last 20 years whatever the distribution”
Rated life is stated in hours, not years. A luminaire rated at 50,000 hours lasts about 12 years in an office lit around 4,000 hours a year, and less in 24/7 spaces. An uplight’s effective output also falls faster if dust settles on its upper face, so include cleaning in the maintenance factor. Our breakdown of LM-80, TM-21 and L-value lifetime ratings explains how to read a lifetime claim.
How to Specify a Direct or Direct-Indirect Scheme
Contractors and designers can check these seven points before a luminaire schedule goes out to tender:
- Ceiling height and construction. If there is no room for a suspension drop, specify direct recessed or surface luminaires. If there is, consider up/down.
- Surface reflectances. Enter real values in DIALux. EN 12464-1 recommends 0.7–0.9 for ceilings and 0.5–0.8 for walls.
- Up/down ratio. Read it from the luminaire’s LDT file rather than the brochure, and check which CIE class it falls into.
- UGR at the real room geometry. Use the UGR table in the photometric file, and target ≤ 19 for general office work or ≤ 16 for CAD rooms. Our guide to glare and anti-glare luminaires covers the optics.
- Wall, ceiling and cylindrical illuminance. Check these against the EN 12464-1 table for each room type, not just the desk lux.
- Controls. Choose DALI-2 or D4i where daylight and presence dimming are expected, and confirm the driver option at the quotation stage.
- Market compliance. Ask for CE or UKCA declarations, ErP (Ecodesign) data and test reports that match the delivered batch. See the LED certification requirements for Europe.
Direct and Direct-Indirect Luminaires from OLAMLED
OLAMLED has manufactured commercial LED luminaires since 2009. Our range covers each distribution discussed above:
| Distribution | OLAMLED series | Key published data |
|---|---|---|
| Direct-indirect (up/down), suspended | PD Series suspended up & down linear light | 1200 mm / 30 W and 1500 mm / 45 W; 65° or 90° beam; UGR 16; >140 lm/W (fixed CCT) |
| Direct, suspended or surface | PF Series linear light | >130 lm/W; UGR < 19; 6,500 lm at 50 W (PF-1500) |
| Direct, recessed linear | PR Series and PR-2 Series | UGR < 16 (PR) / UGR < 19 linkable (PR-2); DALI-2 and D4i driver options |
| Direct, low-glare louvre | LED louvre luminaires (CA/CC/CF Series) | Mirror-aluminium louvre; UGR < 16 |
| Direct, recessed modular | Modular panel luminaires | UGR ≤ 16; custom sizes for UK and German grids |
Every series ships with IES/LDT photometric files for DIALux or Relux, CE documentation and a 5-year warranty. For a side-by-side of the four linear series, see the LED linear light range or the office linear lighting overview.
- Distributors, wholesalers and importers: MOQ from 1 piece on standard models, regional protection for your territory, and SKD linear light kits for local assembly.
- OEM and ODM brands: your housing color, lengths, optics and labeling through our OEM/ODM program.
- Contractors and project managers: samples in 3–5 working days, and mass production in 20–25 working days.
- Lighting designers and engineers: the LDT file for the exact version you are specifying, so the calculation matches the delivered luminaire.
FAQ: Direct and Indirect Lighting
What does direct lighting mean?
Direct lighting means a luminaire sends 90–100% of its light downward, straight onto the surface to be lit, without reflecting off the ceiling or walls first. Recessed panels, downlights and spotlights are direct luminaires.
What is an example of direct lighting?
A 600 × 600 mm recessed LED panel in an office grid ceiling is a typical example of direct lighting. Others include track spotlights on a retail display and high-bay luminaires in a warehouse.
What is the difference between direct and indirect lighting?
Direct lighting sends light straight down to the task. Indirect lighting sends it upward so that it reaches the task after reflecting off the ceiling and walls. Direct is more efficient and gives crisper shadows. Indirect gives a brighter-looking room with lower glare but needs more installed lumens.
What are the disadvantages of direct lighting?
Direct lighting can leave the ceiling and upper walls dark, show a bright luminaire face that causes glare if the optic is poor, and give hard shadows and weak light on faces. Low-glare optics and an added uplight component address all three.
Is direct or indirect lighting better for offices?
For most offices, a direct-indirect combination is better than either alone. Its downward light delivers 500 lx on desks at UGR ≤ 19. Its upward light helps meet the EN 12464-1:2021 office minimums of 150 lx on walls and 100 lx on the ceiling. Where the ceiling is too low to suspend luminaires, low-glare direct panels with light room finishes are the practical choice.
Does direct-indirect lighting use more energy than direct lighting?
Per lumen emitted, direct lighting puts more light on the desk. However, the energy a scheme uses depends on luminaire efficacy, room reflectances and controls as well. A high-efficacy up/down luminaire with DALI-2 daylight dimming can match or beat a direct scheme on annual kWh. Compare the DIALux results, not the distribution types.
