Independent lab test results
By Spektrum Glasses Editorial Team · Published 2026-07-18 · Updated 2026-09-02 · Facts re-checked 2026-09-02 How this page is written and checked: our editorial method · how we verify claims The numbers on this page are transcribed from third-party laboratory reports, hosted in full below. Values are means of the samples tested in each report; per-sample data is in the PDFs.Lens spectral analysis — COLTS Laboratories
- Laboratory: COLTS Laboratories, Oldsmar, Florida, USA — A2LA-accredited to ISO/IEC 17025 (certificate 1612.01), an accredited standard for optical test labs.
- Report: O-SPG111015, dated November 18, 2015. Three samples per lens group, spectral transmittance measured per ANSI Z80.3.
- Full report: O-SPG111015.pdf
Clear lens (computer / everyday styles)
Report group 1. Every value below is the mean of the three samples the laboratory tested, transcribed from the report’s 10 nm transmittance table.
What this shows: the filtering is concentrated at the short, high-energy end of the blue band — 99.99% at 400 nm and 95.1% at 410 nm, the measurement behind the “filters up to 99% of high-energy blue light” figure — and then it tapers steeply. By 420 nm it is 63.0%, by 450 nm 33.1%, and by 500 nm 17.1%. We publish the taper because the single number without it would overstate the lens: the curve crosses 50% transmittance at about 427 nm (interpolated between the 420 nm and 430 nm measurements). Across the whole 400-500 nm band the report’s own average is 47.7% transmittance, i.e. 52.3% filtered. That is why a bare “99% of blue light” claim is one we do not make — the 99% figure belongs to 400 nm, and the band average is about half that. At 91.6% overall visible transmission the lens stays near-clear with no heavy tint. ANSI Z80.3 transmittance and chromaticity: pass, all samples — a standard covering how the lens transmits light and holds colour, not how a reading power is ground. Cosmetic lens, filter category 0.
Yellow lens (evening styles)
The COLTS report labels this lens “amber”. We call it yellow throughout, because that is what it looks like; the measurements below are the report’s, untouched. Report group 2, tested in the same report as the clear lens. Values are means of the three samples tested.
What this shows: the yellow lens filters over 98% of the blue band on average, which is why it is the evening style. The measured shape matters as much as the average — transmittance is flat at or below 0.3% from 400 nm through 450 nm (99.89% filtered across 415-455 nm), then opens progressively: 1.55% at 470 nm, 2.68% at 480 nm, 11.1% at 500 nm, 37.2% at 530 nm. That opening above about 480 nm is the honest difference between this lens and the deeper orange and red lenses below, which hold the filtering through 500 nm and beyond. A percentage alone does not separate them; the curve does. It is a visibly tinted lens (filter category 1) intended for indoor evening screen use — not for driving.
How a “blue band average” is calculated — and why two honest figures can differ
There is more than one accepted way to average transmittance across the blue band, and they do not give the same answer. We publish both, because a reader comparing our page to a competitor’s should know which convention produced a number:- The laboratory’s own band figure, which weights the measurement across the band as the instrument reports it: 1.35% transmittance for the yellow lens (98.65% filtered), 47.7% for the clear lens (52.3% filtered).
- The plain average of the printed 10 nm points from 400 to 500 nm, which anyone can recompute from the table above: 1.99% for the yellow lens (98.0% filtered), 55.8% for the clear lens (44.2% filtered).
Orange and red lens spectral analysis — manufacturer’s optical laboratory (2026)
- Laboratory: the optical test laboratory of our lens manufacturer. The laboratory’s letterhead is redacted from the hosted copies — supplier identities are commercially confidential — and we disclose that redaction here; the measurement tables are reproduced untouched.
- Reports: two lens certification reports dated July 20, 2026, measuring spectral transmittance from 280 to 780 nm against ANSI Z80.3:2015, EN 1836:2005, EN ISO 12312-1:2013 and AS/NZS 1067:2003.
- Full reports: orange lens, sample 041 · red lens, sample s1825
Orange lens (deep-evening styles)
What this shows: the orange lens’s measured transmittance across the entire 380-500 nm blue band averages 0.04% — a deeper blue-band cut than the yellow lens above — and it also filters most green light below about 540 nm. Transmission rises from roughly 550 nm, so what passes is amber, orange and red light. Filter category 2 tint.
Red lens (night / pre-sleep styles)
What this shows: the red lens filters the blue band (0.17% mean measured transmittance across 380-500 nm) and nearly all green light through 560 nm; transmission begins around 580-590 nm, so what passes is essentially red light. At 18.4% overall visible transmittance it is the deepest tint in the line. Filter category 2 tint.
Where these two lenses are not suitable: both reports grade the lenses against four international sunglasses standards, and both lenses are graded not suitable for road use or driving — in daylight, twilight or at night. The same deep tint that filters the blue and green bands does not meet the colour-recognition and traffic-signal requirements those standards set for sunglasses. They are indoor evening lenses by design; do not wear them for driving.
GLACIAL desk line — materials safety (CPSIA lead screening)
- Laboratory: Zhejiang Lisen Testing Technology Co., Ltd.
- Report: LST25090853EN, dated September 24, 2025, commissioned by PROSPEK Designs. Sample: the Desktop Punching Bag’s desk-clamp assembly (metal substrate, coating, plastic knob).
- Full report: LST25090853EN-desktop-clamp.pdf
Results relate to the samples analyzed, per each laboratory’s terms. Reports are reproduced in full, unedited. If a figure on this page ever disagrees with a hosted PDF, the PDF is authoritative.