Bicolour LED lights can affect colour accuracy in raw files, but the impact depends heavily on the quality of the fixture and the colour temperature setting. Shooting raw gives you more latitude to correct white balance in post, but it doesn’t protect you from spectral gaps or poor colour mixing in the light source itself. A fixture with high CRI and TLCI ratings will produce more accurate, more correctable raw files than one that looks neutral to the eye but has missing wavelengths.

Trusting raw files to fix your lighting is costing you time in post

Many professionals assume that shooting raw means colour problems from the light source can be sorted out later. That assumption leads to hours of post-production work trying to recover skin tones or match footage across cuts. The real issue isn’t white balance, which raw handles well; it’s spectral quality. If your bicolour fixture has gaps in its output spectrum, no amount of raw processing will restore the colour information that was never captured in the first place. The fix is to get the light right before you shoot, starting with fixtures that have verified CRI and TLCI scores above 95.

Mismatched colour temperature settings are undermining your colour consistency

On productions where multiple bicolour fixtures are in use, small differences in how each unit renders a given colour temperature can create visible inconsistencies between lights, even when they’re all set to the same Kelvin value. This is especially problematic when cutting between angles or when grading for broadcast delivery. The solution is to use fixtures from the same product line with verified TLCI scores and to test them side by side before the shoot, rather than trusting the dial alone. If you’re unsure which fixture is right for your workflow, you can always talk with a specialist to get a recommendation based on your specific production needs.

What are bicolour LED lights and how do they work?

Bicolour LED lights contain two separate sets of LED chips: one tuned to a warm colour temperature (typically around 2700K to 3200K) and one tuned to a cool colour temperature (typically 5600K to 6500K). By adjusting the relative output of each chip set, the fixture blends the two light sources to produce a mixed colour temperature anywhere within its range.

This mixing approach is what makes bicolour fixtures so practical on set. You can match tungsten practicals, transition to daylight, or hit any point in between without swapping gels or changing fixtures. The trade-off is that the blended output is never quite as spectrally pure as that of a single-channel light tuned to one fixed colour temperature. The quality of the blend, and how well it holds up for colour-critical work, depends entirely on the design of the LED array and the quality of the chips used.

Professional bicolour lighting fixtures use carefully selected phosphor-converted LEDs or RGB+phosphor arrays to keep the spectrum as full and consistent as possible across the entire tuning range. Budget fixtures often show visible colour shifts or spectral dips at certain points in the range, which becomes a problem the moment you need accurate colour reproduction.

Does shooting raw really protect you from LED colour shifts?

Shooting raw protects you from white balance errors, but not from spectral deficiencies. Raw capture records all the data your sensor collects, so if your light source has gaps in its spectrum, those gaps are baked into the file regardless of format. White balance is a mathematical adjustment; missing spectral energy cannot be added back in post.

Where raw genuinely helps is with white balance drift. If a bicolour fixture shifts slightly in colour temperature during a long take or between setups, raw gives you the flexibility to correct that in post without degrading image quality. This is a real advantage over shooting in a compressed log or baked-in format.

The distinction that matters is this: raw handles white balance problems well. It does not handle spectral quality problems. A fixture with a CRI of 98+ and a TLCI score at or near 100 will produce raw files that grade cleanly and hold up under heavy correction. A fixture with lower scores will produce files in which certain hues—particularly reds and skin tones—look off no matter how you adjust the white balance.

How does colour mixing in bicolour LEDs affect CRI and TLCI?

Colour mixing in bicolour LEDs can cause CRI and TLCI scores to drop at the extremes of the colour temperature range and at certain mid-range blending points. The two chip sets each have their own spectral output profile, and where they overlap—or fail to complement each other—the blended light can develop spectral gaps that reduce colour accuracy.

CRI measures how accurately a light source renders a set of reference colours compared to a reference illuminant. TLCI does the same, but specifically for broadcast camera systems. Both scores can vary across a bicolour fixture’s tuning range, meaning a fixture might score well at 5600K but perform noticeably worse at 3200K or at intermediate settings like 4000K.

This is why published CRI and TLCI figures for bicolour fixtures should ideally be verified across the full tuning range, not just at a single colour temperature. A fixture that maintains consistent scores from warm to cool is significantly more reliable for professional bicolour lighting work than one that peaks at a single point.

What colour temperature range is safest for raw file accuracy?

The safest colour temperature settings for raw file accuracy are the endpoints of a bicolour fixture’s range—typically full warm or full cool—because these settings use a single chip set at full output rather than blending two. Mixed settings, especially in the 3800K to 4500K range, are where spectral inconsistencies are most likely to appear.

In practice, you often need a mixed setting to match the ambient light of a location. When you do, the key is to use a fixture with a verified, consistent TLCI score across its range. A fixture that maintains a TLCI of 95 or above at every point in its tuning range is far more dependable than one that only hits those numbers at the extremes.

For raw shooters doing critical colour work, it’s also worth setting your camera’s white balance to a fixed Kelvin value that matches your light, rather than using auto white balance. This gives you a stable reference point in post and makes it easier to match shots across a multi-camera setup or across different days of shooting.

How do you verify colour accuracy on set before shooting?

The most reliable way to verify colour accuracy on set is to use a spectrometer or colour meter to measure the actual output of your fixture at the colour temperature you plan to use. Shooting a colour checker chart under your light and reviewing it on a calibrated monitor is also a practical and widely used method.

  1. Set your fixture to the colour temperature you’ll be using for the shoot.
  2. Place a colour checker chart in the scene and shoot a reference frame.
  3. Review the frame on a calibrated monitor or in your grading software and check how the neutral patches and saturated colours render.
  4. If you have a spectrometer, measure the fixture’s output directly to check for spectral gaps before shooting begins.

For multi-fixture setups, test each unit individually and compare them side by side. Even fixtures from the same product line can vary slightly, so this step is worth taking when colour consistency across the frame matters.

What should you look for in a bicolour LED light for critical colour work?

For critical colour work, prioritise fixtures with a CRI of 95 or above and a TLCI score as close to 100 as possible, verified across the full tuning range. Also look for a wide and stable colour temperature range, consistent output without flicker, and compatibility with the modifiers and accessories your workflow depends on.

Beyond the headline specs, consider:

  • Whether the CRI and TLCI figures are tested at multiple points across the tuning range, not just at a single colour temperature.
  • Whether the fixture is compatible with your existing accessories, including softboxes, Fresnel lenses, and mounting systems.
  • Build quality and thermal management, since heat affects LED performance and colour stability over long shooting days.
  • Battery runtime and power options if you’re working on location without reliable mains power.

Weight and portability also matter more than many buyers expect. A fixture that’s too heavy or awkward to reposition quickly becomes a bottleneck on a fast-moving set. Lightweight fixtures that maintain professional colour specs give you both speed and accuracy without compromise.

How Maxima LED helps with professional bicolour lighting solutions

We built Maxima LED specifically for professionals who can’t afford to compromise on colour. Our fixtures are designed, engineered, and manufactured entirely in Italy, and every product we make is built around a core commitment to colour accuracy, with a 98.6 CRI and a perfect 100 TLCI score across the range.

The Maxima Rapida is a strong example of what that looks like in practice. It delivers 23,000 lumens in a body that weighs just 1.8 kg, with a bicolour range from 2,600K to 6,800K and IP54 weather protection for location work. It runs directly from a V-mount battery with no external ballast required, and it’s compatible with both Profoto and Bowens accessories, so it fits straight into your existing kit without adapter headaches. It’s easy to use whether you’re a seasoned gaffer or a professional just starting to build a serious lighting setup.

Here’s what makes our approach to professional bicolour lighting different:

  • Consistent 98.6 CRI and 100 TLCI across the full colour temperature range, not just at the endpoints.
  • Lightweight, portable fixtures designed for fast repositioning on set without sacrificing output or colour quality.
  • Full Profoto and Bowens compatibility through our OmniMount system, made in Italy to the same standard as the fixtures themselves.

If colour accuracy in your raw files matters to your work, we’d love to show you what Maxima LED can do. Explore our full range of bicolour LED fixtures at Maxima LED and find the right tool for your next production.

Frequently Asked Questions

Can I use bicolour LED lights for skin tone accuracy without a spectrometer?

Yes, you can get reliable results without a spectrometer by using a colour checker chart and reviewing it on a calibrated monitor in your grading software before the shoot begins. Focus specifically on how the neutral patches and skin-tone swatches render — if they look clean and consistent under your fixture, you're in a good position. That said, a spectrometer gives you objective data about spectral gaps that your eye and monitor can't always catch, so it's worth investing in one if colour-critical work is a regular part of your production workflow.

How do I know if my bicolour fixture is causing problems in post versus my camera settings?

The clearest sign that your fixture is the problem — not your camera settings — is when white balance adjustments in post fail to fully correct certain hues, particularly reds and skin tones, even after careful correction. If shifting the white balance slider brings neutrals into line but saturated colours still look off or muddy, you're almost certainly dealing with spectral gaps in the light source rather than a camera or settings issue. Shooting a colour checker reference frame under the same fixture and comparing it to a reference image in your grading software is the fastest way to isolate the cause.

What's the biggest mistake professionals make when mixing bicolour LEDs with ambient light on location?

The most common mistake is setting the fixture's colour temperature by eye to roughly match the ambient light, rather than measuring both sources and dialling in a precise match. Even a small mismatch — say, 200K to 300K off — can create a colour cast that's difficult to grade out cleanly, especially in raw files where the two light sources are mixed in the same frame. The better approach is to use a colour meter to measure your ambient light first, then set your fixture to that exact Kelvin value, and lock your camera's white balance to the same number to give yourself a stable, matchable reference in post.

Do CRI and TLCI scores matter differently depending on whether I'm shooting for film versus broadcast?

Yes — TLCI is specifically designed to predict how a light source will perform when captured by a broadcast camera system, making it the more relevant metric for broadcast and television work. CRI is a more general measure of colour rendering accuracy and is widely used across both film and photography. For broadcast delivery, prioritise fixtures with a TLCI score of 95 or above; for narrative film or photography where you have more grading flexibility, a CRI of 95+ is a reliable benchmark. Ideally, look for fixtures that score well on both metrics across the full tuning range, not just at a single colour temperature.

How should I handle colour consistency when using bicolour LEDs across multiple shooting days?

The most reliable approach is to document your exact fixture settings — colour temperature, output level, and any diffusion or modifiers in use — and recreate them precisely on each shooting day. Shoot a colour checker reference frame at the start of every session under the same conditions, and use those frames as a matching reference in your grading software when you bring the footage together. If you're using multiple fixtures, keep them from the same product line and confirm they've been tested for consistent TLCI performance across the range, since even units from the same manufacturer can vary slightly between production batches.

Is there a point where upgrading my LED fixtures will save me more time than upgrading my grading software or skills?

Absolutely — and for most professionals doing colour-critical work, better fixtures pay off faster than additional post-production tools. Grading software and skills can only work with the colour information that was actually captured; if your fixture has spectral gaps, no software update or technique will restore what wasn't there. Investing in fixtures with verified CRI 95+ and TLCI scores close to 100 reduces the time spent on corrective grading, makes matching shots across cuts significantly easier, and produces more consistent results that hold up under heavy colour work — all of which compounds across every project you shoot.

Can bicolour LEDs be used reliably for green screen or chroma key work?

Bicolour LEDs can work for green screen, but spectral quality is especially critical in this application because chroma keying depends on clean, consistent colour separation between the subject and the background. A fixture with spectral gaps or poor colour mixing can introduce inconsistencies in the green channel that make keying harder and result in fringing or spill that's difficult to clean up in post. For chroma key work, use fixtures with the highest available CRI and TLCI scores, test them at the exact colour temperature you plan to use, and light the screen and subject separately to maintain control over both.

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