Lighting for Photography: Everything You Need to Know

Quick answer: Choose continuous photography lighting by the illuminance reaching your subject, then compare colour temperature, colour rendering and flicker in camera recordings. For video, include TLCI in the comparison: it models a camera and display, whereas CRI was not designed for television (EBU Tech 3355).

This guide covers continuous lighting for still photos and video: how to interpret brightness figures, calculate an illustrative lighting budget and separate colour settings from colour quality. Use the LEDask lighting calculator hub to explore the related tools once you know which quantity you need.

How bright should photography lighting be?

Use lux at the subject to describe illumination; a panel's total lumens alone do not specify how much light reaches that area. According to Wikipedia's lux reference, lux means lumens per square metre: spreading the same output across more area lowers the average illuminance.

These reference levels provide context, not exposure prescriptions. According to Wikipedia's illuminance table:

There is no verified portrait or product-photo lux target in these references. Choose a working target for your scene and assess the resulting image at the camera settings you intend to use. Do not turn the TV studio reference into a requirement for every photograph.

Worked example: light reaching a backdrop

Assumed inputs: 5,000 lumens actually reach a backdrop zone of 2 m², distributed evenly. This is an idealised example, not a panel-output measurement.

• Formula: average illuminance = arriving lumens ÷ area.
• Substitution: 5,000 lm ÷ 2 m².
• Result: 2,500 lx.

The distinction is the word arriving. Substituting a fixture's total rated output assumes all that output reaches the chosen zone. This example does not account for beam losses or uneven coverage, so it cannot establish the brightness at every point on a real backdrop.

Calculate a general lighting budget

Use the foot-candle calculator for an area-based lumen estimate. Its formula is total lumens = (target foot-candles × area in square feet) ÷ (CU × LLF). CU is the coefficient of utilisation; LLF is the light loss factor. These are planning inputs, not measured properties of your photographic set.

According to Wikipedia's lux reference, a foot-candle is about 10.764 lux; the calculator uses that same conversion. Choose its custom setting to enter your own target rather than treating a room preset as a photography standard.

Worked example: an assumed small set

Assumed inputs: a 10 ft × 10 ft area, a target of 50 fc and fixtures rated at 5,000 lm each. Assume CU = 0.7 and LLF = 0.85, matching the calculator's initial planning figures. None of these inputs is a recommended photography minimum.

• Area = length × width = 10 × 10 = 100 ft².
• Target illuminance = fc × 10.764 = 50 × 10.764 = 538.2 lx.
• Utilisation and loss multiplier = CU × LLF = 0.7 × 0.85 = 0.595.
• Numerator = target fc × area = 50 × 100 = 5,000 lm.
• Required fixture output = 5,000 ÷ 0.595 = approximately 8,403.36 lm.
• Fixture count = round up(required output ÷ output per fixture) = round up(8,403.36 ÷ 5,000) = round up(1.680672) = 2 fixtures.

That is an area-lighting estimate. It does not specify a key-light position, guarantee even illumination or predict the exposure of a face. Use it to understand the output budget, then evaluate illumination where the subject will actually be.

Which colour temperature should you choose?

Start with the colour reference you intend to work with. According to Wikipedia's colour-temperature reference, daylight-balanced photographic film uses about 5,500–5,600 K, tungsten-balanced film and lighting are typically referenced at 3,200 K (some tungsten lamps are 3,400 K), and the D65 daylight viewing standard is 6,500 K. Those are different references; “daylight” does not identify a single interchangeable setting.

For a daylight-oriented setup, use the photographic daylight reference as your starting point; for a tungsten-oriented setup, use the tungsten reference. Treat this as a colour choice, not a brightness target. Kelvin describes colour temperature, while lux describes illumination.

According to the same colour-temperature reference, digital cameras and raw-processing software offer white-balance presets, with some allowing explicit kelvin entry. Temperature adjustments operate along the blue–yellow axis, while tint handles magenta–green. If a neutral object looks green, changing only the kelvin value addresses a different colour axis.

Is CRI enough, or should you look at TLCI?

For video, compare TLCI as well as CRI. The EBU's TLCI explanation describes an assessment that models a complete television camera and display to address limitations of CRI for television.

According to Wikipedia's CRI reference, headline CRI Ra averages R1–R8 and excludes R9, the saturated-red sample. The same reference identifies R9 as relevant to film, video and skin-tone rendering. A headline average therefore leaves out a colour result worth examining for portraits; our CRI lighting guide explains the terminology further.

TLCI also needs the right interpretation. Its reference light has the test light's correlated colour temperature, so it compares rendering against a reference at that temperature; it does not award a better score simply for choosing a particular kelvin setting (EBU Tech 3355).

According to EBU Tech 3355, the TLCI value Qa was calibrated to give a typical daylight fluorescent tube a score of 50, described as an approximate boundary between lighting that can and cannot be corrected for television. That is context for the scale, not a universal buying threshold or a promise about your camera's results.

Why do LEDs flicker on camera?

A light that looks steady to your eyes can still produce artefacts in a recording. According to Wikipedia's flicker reference, cameras can detect higher-frequency flicker than human vision, and motion-photography shutter speeds can interact with flicker to create visible artefacts.

Use a short recording check before committing to a setup:

• Record the actual subject at the intended frame rate and shutter setting.
• Include the brightness settings you expect to use during the shoot.
• Inspect the recording for bands or brightness changes.
• Repeat the recording after changing a shooting setting or the light output.

This is a check of the tested combination. It does not establish that every other shutter setting or output level will produce the same result.

FAQ

How many lux do I need for portraits?

The references here do not establish a portrait-specific target. Choose an assumed target, assess your subject at the intended camera settings and adjust from the resulting image; the worked calculations explain quantities rather than prescribe exposure.

Is daylight or tungsten better for photography?

Choose the reference that suits the intended setup. According to Wikipedia's colour-temperature reference, photographic daylight is about 5,500–5,600 K and tungsten-balanced is 3,200 K (some tungsten lamps are 3,400 K); neither number is a colour-rendering score.

Does a high CRI tell me everything about skin tones?

No. According to Wikipedia's CRI reference, Ra excludes saturated-red R9, which is relevant to skin-tone rendering, so examine that result separately.

Does TLCI measure whether a light is daylight-balanced?

No. TLCI uses a reference at the test light's correlated colour temperature, so the score evaluates rendering relative to that reference rather than selecting a preferred colour temperature (EBU Tech 3355).

Can an LED look steady but flicker in video?

Yes. According to Wikipedia's flicker reference, camera sensitivity and shutter interaction can reveal flicker artefacts that are not apparent to the eye; inspect an actual recording.