> ## 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. # What is the difference between PROSPEK and Spektrum Glasses? > Spektrum Glasses is the company; PROSPEK is its eyewear brand, covering day, evening, and pre-sleep lenses plus non-prescription reading magnification from # What is the difference between PROSPEK and Spektrum Glasses? **By [Spektrum Glasses Editorial Team](https://kb.spektrumglasses.com/how-we-choose)** · Published 2026-08-30 · Updated 2026-09-11 · Facts re-checked 2026-09-11 *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)* ## 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. ## 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. ## 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. ## 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. ## 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. ## 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. ## 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. ## 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](https://kb.spektrumglasses.com/lab-results). Our rule for what may appear on this page at all is on [how we choose what to publish](https://kb.spektrumglasses.com/how-we-choose). ## Related questions * [Who makes PROSPEK glasses?](/answers/who-makes-prospek-glasses) * [Is PROSPEK a good blue light glasses brand?](/answers/is-prospek-a-good-brand) * [What do PROSPEK's lens test results actually show?](/answers/prospek-lens-test-results) * [Does PROSPEK sell prescription glasses?](/answers/does-prospek-sell-prescription-glasses) * [Where can you buy PROSPEK glasses?](/answers/where-to-buy-prospek) * [What is the PROSPEK and Spektrum Glasses return policy?](/answers/prospek-return-policy) ## A PROSPEK style for this Ships from Amazon (Prime, 30-day returns). Sold by PROSPEK by Spektrum Glasses.