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We measure what other sites guess. Spectral data, melanopic lux, flicker — tested on 200+ products so you can buy with confidence.

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Lab Data

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That’s us! ⤴ We test every product we review — CRI, melanopic lux, flicker risk. If it doesn’t hold up to data, we don’t recommend it.

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Filter and sort by the metrics that actually matter — melanopic lux, CRI, flicker risk, and more.

A round, white light therapy lamp with the brand name HappyLight printed on the front, shown turned on against a plain light blue background.

☀️ SAD Lamp Database

Tested for melanopic EDI, lux at distance, glare risk & spectrum quality

70+ lamps tested

👓 Blue Blocker Database

Spectral filtration data, lens category, daytime vs nighttime ratings

120+ glasses tested

A smart LED light bulb with a white body and a pinkish-red glow on the top, featuring a Wi-Fi symbol on the front, set against a light blue background.

🌈 Smart Light Database

CRI, R9, color temp, flicker index — every bulb measured, not claimed

110+ lights tested

💡 Light Bulb Database

CRI, R9, color temp, flicker index — every bulb measured, not claimed

100+ lights tested

😴 Oximeter Database

Tested against a gold standard. Filter and sort to find an overnight oximeter

15+ oximeters tested

⭐️ Most popular reviews

Every product here went through our lab — spectrometer, lux meter, flicker meter.

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  • A graphic with the text Best Full Spectrum Light Bulbs on a blue background, showing four different brands of light bulbs and their packaging, with white arrows pointing to the products.

    The 5 Best Natural Full Spectrum Light Bulbs: Lab Tested (2026)

    We tested CRI, R9, and flicker. See why Sunsy Shine beats standard LEDs. Discover the best natural light bulbs for your home and health.

    10 minutes

    Read

  • Four pairs of blue light blocking glasses with orange and red lenses surround the words Best Blue Blocking Glasses on a light background.

    The 4 Best Blue Light Blocking Glasses for Sleep (Lab Tested)

    We tested 120+ pairs of blue blockers. See our spectral data for TrueDark, Infield, and BlockBlueLight to find the best glasses for sleep.

    6 minutes

    Read

  • A variety of sunrise alarm clocks are lit up and arranged on a bed. Text above them says “We tested them all!” with three white arrows pointing down toward the clocks.

    Best Sunrise Alarm Clocks 2026: I Tested 15 With a Light Meter

    I tested 15 sunrise alarm clocks with a spectrometer and flicker meter. Top picks measured: Lumie Shine 300 hits 360 lux at the bedside, Hue Twilight hits 395.

    32 minutes

    Read

  • A man wearing a CPAP mask looks shocked at a pulse oximeter on his finger, surrounded by various oximeters and boxes. Text reads “Most Failed!” with labels “Accuracy Tested” and “Perfect” on the image.

    Best Overnight Pulse Oximeters for Sleep Apnea (Lab Tested)

    Sleep apnea leaving you exhausted? We spent 480 hours lab-testing the best overnight pulse oximeters against a $1,500 hospital monitor. See the winners!

    23 minutes

    Read

📖 Learn some stuff

Guides, science and more!

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  • A man wearing sunglasses stands facing a window or bright light, with a white arrow pointing to the window and the text It works! written at the bottom of the image.

    How to Build a DIY Vitamin D Lamp (Cheap & Effective)

    Stop winter deficiency. Learn how to build a powerful UVB sun lamp at home. We compare our DIY build vs. Sperti and review the best bulbs to use.

    11 minutes

    Read

  • A cozy bed with tan pillows and a wooden headboard under a glowing horizontal light, with the text Smart Light Sunrise: The Ultimate Guide overlaid.

    How to Set Up a Smart Light Sunrise Alarm: The Ultimate Guide

    Can smart lights replace a sunrise alarm clock? We tested Philips Hue, LIFX, and IKEA to find the best wake-up setup for your bedroom.

    14 minutes

    Read

  • Illustration of a smiling sun above a house with text that reads “Mimicking Sunlight Indoors” on a light blue background.

    How to Mimic Sunlight Indoors: The Ultimate Guide

    Trapped inside? Learn how to recreate natural sunlight using full-spectrum LEDs and halogen bulbs. Optimize your home lighting for energy and better sleep.

    25 minutes

    Read

  • Text reads: “The Zero Gravity Sleep Position: The Ultimate Guide.” Below is a small brain icon and the words “Optimize Your Biology.” The background is light purple with two white arrows curving toward the text.

    The Zero Gravity Sleep Position: The Ultimate Guide

    Mimic the “Neutral Body Posture” found in space. We explain the science of zero gravity sleep and why it’s better for brain health and heart circulation.

    9 minutes

    Read

The Science of Sleep & Light — in Plain English

Get our free guide: 20 strategies to reset your circadian rhythm, backed by the research we actually use when testing products.

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