What if the problem
isn’t your eyes?
For forty years, we’ve focused on one thing: building reading light that behaves more like daylight, not just the colour temperature, but the spectrum your eyes actually receive.
Reading fatigue is not always your eyes. Often it is the light.
Many LEDs look white at a glance, but the spectrum underneath is uneven. The common pattern is a narrow blue spike and weaker deep red, which can reduce page contrast over time.
The problem profile in many standard LEDs
What often happens next: people raise brightness, move the lamp closer, and still feel they are working too hard to keep text stable by evening.
Most LEDs are engineered to look white efficiently. On a spectrometer, many still show the same imbalance: concentrated blue energy and weaker deep red. That imbalance is measurable, and often visible on the page.
A standard LED usually uses a blue chip plus a basic phosphor coating to appear ‘white’. It works, but the spectral shape is uneven: strong blue energy, weaker deep reds, and missing parts of the visible range.
On the page, that often shows up as flatter contrast. Blacks can look softer, whites can look harsher, and fine detail can feel unstable after long sessions.
Better light won’t change your prescription. It can change the quality of information your eyes receive while you read.
If you have an eye condition, good light isn’t a substitute for care, but it can make reading more comfortable.
So we rebuilt the light engine from source to spectrum, then measured the result independently.
Where we change the engineering decision.
Most lamps start with a standard blue chip and correct later. We start from a broader violet source.
Most reading lamps begin with a blue emitter because it is efficient and low cost. We use a specialist violet emitter because it gives a smoother starting profile for reading light.
If the source begins with a narrow blue peak, phosphor has to compensate hard downstream. You can hit a white appearance, but the underlying spectrum is harder to balance for long reading sessions.
A violet starting profile is broader, so we have more control over glare, contrast and colour balance before the final spectrum is finished.
Higher blue concentration at source. Efficient and common, but it leaves more corrective work for the phosphor system.
Broader output with less blue concentration at source, giving tighter control over the final reading spectrum.
Reader effect: a less aggressive source profile and a cleaner contrast base for print.
Then we shape the spectrum your eyes actually use.
The objective is practical: stable text contrast, natural colour balance, and less visual strain over time.
Daylight is continuous across the visible range. That continuity is one reason reading by a window often feels easier.
Indoors, we can’t copy daylight perfectly, but we can get materially closer than a standard LED profile.
Using a proprietary phosphor blend driven by our violet source, we rebuild a balanced 380–780 nm spectrum, including stronger deep-red coverage where many LEDs are weakest.
Source profile
We begin from broader violet output rather than a narrow blue spike.
Spectrum shaping
Phosphor conversion is tuned to fill the visible range, including deeper red.
Laboratory verification
The final output is measured on calibrated instruments against TM-30 metrics.
What this means when you sit down to read
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Text contrast holds up
Stronger deep-red support improves ink-to-paper separation, so black text keeps cleaner edges and small print stays easier to hold.
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Colours stay believable
Reds, greens and skin tones stay closer to natural balance instead of drifting cold.
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Long sessions feel less demanding
With a fuller spectrum, many readers report lower visual fatigue over time.
Measured spectrum comparison: HD Pro and a typical LED.
These are measured spectrophotometer curves, not simulated marketing graphics. Gold is HD Pro. Blue is the ordinary LED comparison from the Boshite report.
One data set, four independent views.
Each chart examines a different part of colour quality: fidelity by hue, gamut balance, white point, and chroma stability.
View full measurement fields
The numbers matter. But the real test is what you see.
Left: standard LED. Right: Daylight Wavelength Technology. No filters. No tricks.
Drag to reveal the difference
Questions worth asking.
The technology, explained furtherCRI (Colour Rendering Index) dates from the 1960s and tests only 8 pastel samples. It was designed for fluorescent tubes, not LEDs. A lamp can score ‘90+ CRI’ and still produce a spectrum full of gaps.
TM-30 is the modern replacement. It tests 99 real-world colour samples and gives two scores: Fidelity (Rf: how accurately colours are reproduced) and Gamut (Rg: whether they’re over- or under-saturated). Our HD Pro scores Rf 98 and Rg 101, near-perfect accuracy with natural saturation, independently verified.
Not usually. ‘Daylight’ often means a cooler colour temperature, not a more complete spectrum. A bulb can look whiter and still have the same uneven LED signature underneath (strong blue peak, weak deep reds, gaps elsewhere).
Our claim isn’t ‘it looks like daylight’. It’s measured performance: a balanced spectrum and TM-30 results you can check.
Because it’s built differently. The violet LED foundation, the phosphor system, the optics and the thermal design needed to run it properly cost more than a standard blue-chip lamp.
You’re also paying for the practical side: long warranty, proper support, and a light engine designed as a precision component rather than a disposable bulb.
Yes, download the PDF above. It includes the instrument used, the TM-30 standard, and the full results for Rf, Rg and R9.
Same spectrum. Different power and control.
Every current model uses Daylight Wavelength Technology™. Choose by how much light and adjustability you need.
HD Pro
Flagship output, precision beam control and modular upgrades.
From £449.99
View HD Pro options
HD Essential
The same spectrum in a simpler, lower-cost format.
From £349.99
View HD Essential optionsHD Pro is our flagship for maximum power and precision control. HD Essential keeps the same spectral quality in a simpler build. See the full range: All Lights | Questions? 0800 032 9366