SkyBlue® A21 LED Light Bulb

Wattage: 9W LED  Brightness: 720 Lumens  Light Color: 1,900 – 3,500K Lamp Type: A21

Daytime + Nighttime Circadian Lighting Solution – The A21 Bulb

9W LED Replaces 60W Incandescent

SkyBlue® A21 is an LED retrofit bulb, powered by BIOS SkyBlue® patented circadian technology. BIOS SkyBlue® emits specific wavelengths that provide the same circadian benefits of the sun during a 24-hour period.

The A21 Bulb’s Biological Benefits

  • Strengthens Circadian Rhythm
  • Increases Alertness
  • Enhances Productivity
  • Boosts Mood
  • Promotes A Better Nights Sleep

$12.00$66.25

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Features + Benefits

SkyBlue® A21 is an LED retrofit bulb, powered by BIOS SkyBlue® patented circadian technology.BIOS SkyBlue® emits specific wavelengths that provide the same circadian benefits of the sun during a 24-hour period.

During the daytime, it infuses the critical sky-blue spectrum (490nm) to enhance productivity and boost mood. For your safety, the SkyBlue® technology emits minimal light in the blue light hazard region associated with retinal injury.

At nighttime, the SkyBlue® A21 bulbs dim to a cozy warm amber, removing all blue light for the perfect nighttime lighting solution. This removes the sky-blue spectrum and creates a warmer atmosphere that promotes natural melatonin production and better sleep.

$18.95$90.15

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Strengthens Circadian Rhythm

Delivering circadian light by bringing the natural outside light indoors.


More Productive Days

Provides mood stimulating and productivity-enhancing light during the daytime.


Promotes Better Sleep

Bio-Dimming technology that brightens during the day and dims during the night.


Patented Technology

Unique, all-in-one day/night circadian light source utilizing the peak spectrum of 490nm.

Performance Summary
Lamp Wattage 9W LED Replaces 60W Incandescent
Lamp Type A21
Lamp Base E26 (Medium)
Voltage AC-120V/60Hz
Rated Life (Years) 13.7
Light Output (lumens) 720 lm
Spec Sheets
Biological Benefits
Strengthens Circadian Rhythm
Increases Alertness
Enhances Productivity
Boosts Mood
Promotes A Better Nights Sleep

The BIOS Difference.

Biology-First Approach.

With NASA’s International Space Station circadian lighting Subject Matter Expert, an Olympic and professional sports teams Jet Lag mitigation expert, and research partnerships with governmental agencies and leading universities on light and health, our team of scientists make products that solve problems. And we do it using science.

Wellness Lighting, Not Tunable Lighting.

Our lights focus on healthy ingredients: sharp clarity, superior color for visual acuity, and a spectrum that closely matches nature, so you sleep better at night and have more energy during the day. We make better lights for better health.

NASA Approved.

Our team is led by the Subject Matter Expert for NASA International Space Station circadian lighting system.