> ## Documentation Index
> Fetch the complete documentation index at: https://kb.spektrumglasses.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Clear vs Yellow vs Orange vs Red Blue Light Lenses — Measured Comparison

> Spectrometer-measured comparison of the four PROSPEK lens tints: blue-band filtration, visible transmittance, colour trade-offs, and when to wear each.

# Clear vs yellow vs orange vs red lenses — what the spectrometer says

**By [Spektrum Glasses Editorial Team](https://kb.spektrumglasses.com/how-we-choose)** · Published 2026-07-20 · Updated 2026-08-10 · Facts re-checked 2026-08-10

*How this page is written and checked: [our editorial method](https://kb.spektrumglasses.com/how-we-choose) · [how we verify claims](https://kb.spektrumglasses.com/how-we-verify)*

Most "which lens colour?" advice is opinion. This page is the measured version: every figure below comes from the laboratory reports hosted in full on our [lab results](/lab-results) page.

| Lens       | Blue band 380-500 nm filtered (measured)                      | Visible light transmitted | Colour distortion    | Intended use                   | Driving |
| ---------- | ------------------------------------------------------------- | ------------------------- | -------------------- | ------------------------------ | ------- |
| **Clear**  | 99.99% at 400 nm, 95.1% at 410 nm; less at longer wavelengths | 91.6%                     | none — near-clear    | all-day computer work          | yes     |
| **Yellow** | 98.65% (band average)                                         | 65.1%                     | visible yellow tint  | evening screen use             | no      |
| **Orange** | 99.96% (band average), plus most green below 540 nm           | 39.0%                     | strong — warm view   | late evening, 2-3 h before bed | no      |
| **Red**    | 99.83% (band average), plus green through 560 nm              | 18.4%                     | strongest — red view | last hours before sleep        | no      |

## How to read this

* **The trade-off is one line:** the more of the blue (and green) band a lens filters, the more it tints what you see. There is no clear lens that filters the whole blue band — a claim like that should come with a spectral report, and ours is linked above.
* **Clear** filters hardest at the short, high-energy end (99.99% at 400 nm) while staying near-clear, which is why it is the all-day lens.
* **Yellow** filters over 98% of the whole blue band and is the first visibly tinted step.
* **Orange** takes the blue band to 99.96% measured and also cuts most green light below about 540 nm.
* **Red** extends the cut through 560 nm. Research on circadian photoreception centres on wavelengths around 480 nm, with sensitivity extending into green — the red lens is built for exactly that band.
* **None of the tinted lenses are for driving.** The same tint that filters blue and green light fails the traffic-signal colour-recognition requirements sunglasses standards set — the test reports grade yellow, orange and red not suitable for road use, and we publish that.

*Which is right for you: [evening screens guide](/evening-screens-and-sleep) · full data: [lab results](/lab-results) · how to check any brand's claims: [verification guide](/verify-blue-light-claims).*