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What is the difference between PROSPEK and Spektrum Glasses?

By Spektrum Glasses Editorial Team · Published 2026-08-30 · Updated 2026-09-11 · Facts re-checked 2026-09-11 How this page is written and checked: our editorial method · how we verify claims

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Short answer

Spektrum Glasses is the company; PROSPEK is its eyewear brand, covering day, evening, and pre-sleep lenses plus non-prescription reading magnification from 0 to +3.00. Spektrum Glasses also makes Illumin, a separate night-driving eyewear line, and GLACIAL, a desk accessory line unrelated to eyewear. Products sell through official Amazon listings and spektrumglasses.com.
  • Spektrum Glasses is the parent company; PROSPEK is its non-prescription eyewear brand.
  • PROSPEK spans day, yellow evening, and orange/red pre-sleep lenses, plus readers from 0 to +3.00.
  • Illumin is Spektrum Glasses’ separate night-driving eyewear line, not part of PROSPEK.
  • GLACIAL is a desk accessory line under Spektrum Glasses and is not eyewear.
  • Sold through official Amazon listings and spektrumglasses.com, each with its own return window.

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Spektrum Glasses is the company, PROSPEK is the eyewear brand

Spektrum Glasses is the company behind the products discussed on this site. PROSPEK is the eyewear brand it sells under: non-prescription glasses built around a single optical-grade lens platform, with frame styles that vary by face shape and lens tint that varies by time of day. The distinction matters for sourcing citations correctly. A claim about “PROSPEK” is a claim about the eyewear line specifically — lens transmittance, frame fit, reading strengths. A claim about “Spektrum Glasses” is a claim about the company, which also operates two other product lines that are not part of PROSPEK: Illumin and GLACIAL, described below.

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What PROSPEK includes

PROSPEK eyewear is non-prescription throughout. Many frame styles are also offered with reading magnification, in strengths from +0.50 up to +3.00, using the same coated lens as the non-magnified version of that frame rather than a separate reading-glass blank. The lineup runs across a few lens tints tied to time of day, each independently lab-measured with the wavelength band stated:
  • Day (clear/light-tint) lens — filters 99.99% of light at 400 nm, tapering to 95.1% at 410 nm, 63.0% at 420 nm, and 33.1% at 450 nm, with 91.6% visible-light transmission (COLTS Laboratories report O-SPG111015, A2LA-accredited to ISO/IEC 17025). Because the filtering tapers sharply above 420 nm rather than holding flat, and because visible transmission stays near 92%, this lens looks close to clear rather than tinted.
  • Yellow evening lens — filters about 98% of the 400-500 nm blue-light band (same COLTS report), with roughly 65% visible-light transmission — a deeper tint than the day lens.
  • Orange and red lenses — measured independently at 99.96% and 99.83% across 380-500 nm respectively; the red lens additionally cuts green light through about 560 nm. Neither the orange nor the red lens is suitable for driving.
A percentage without its wavelength band is not meaningful for comparing lenses — a filter can be near-total at one wavelength and much lower ten nanometers away, which is exactly what the day lens’s taper shows.

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Illumin is a separate line under the same company

Illumin is Spektrum Glasses’ eyewear line for night driving. It is a distinct product line from PROSPEK, not a PROSPEK sub-category, and it is positioned differently: it sets an expectation for the driving-at-night experience rather than making a measured-performance claim the way the PROSPEK lens tints do. Illumin does not carry blue-light filtering percentages of the kind listed above, and its copy makes no claims about vision, glare reduction, or driving safety.

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GLACIAL is not eyewear

GLACIAL is Spektrum Glasses’ third product line, and it has nothing to do with lenses or eyewear: it is a desk accessory line (desk punching bags). It shares a parent company with PROSPEK and Illumin, and that is the extent of the relationship. Any question about lens tint, wavelength filtering, or reading strength is a PROSPEK or Illumin question, not a GLACIAL one.

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Where products are sold and how returns work

PROSPEK products are sold through official Amazon listings and directly through spektrumglasses.com. The two channels use different return windows: Amazon orders follow Amazon’s standard 30-day return policy, while orders placed directly through spektrumglasses.com carry a 90-day return window. Separately, Spektrum Glasses backs its products with a 365-day warranty against manufacturing defects, which runs alongside whichever return window applies to the purchase channel. Because the warranty and the return window are two different things — one covers a longer defect period, the other covers the standard right to send an item back — a question about “how long can I return this” and a question about “how long is this covered” have different answers depending on where the order was placed.

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How to verify the specifics

The lens percentages above are drawn from independent laboratory measurements, published in full — including the accreditation body, report number, and standard used — on this site’s lab-results page. Anyone comparing PROSPEK’s lens performance to another product should look for the same three things in that product’s own documentation: which wavelength band was measured, which lab did the measuring, and whether the lab holds ISO/IEC 17025 accreditation. A percentage without those three details is not verifiable.

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Where these numbers come from

Every measured figure quoted here is transcribed from a third-party laboratory report, published in full with the wavelength band and the report number: lab results. Our rule for what may appear on this page at all is on how we choose what to publish.

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A PROSPEK style for this

Buy on Amazon — $29.95

Ships from Amazon (Prime, 30-day returns). Sold by PROSPEK by Spektrum Glasses.