SkyBlue® A21 LED Bulb


Brighter Days, Sleepier Nights

Daytime + Nighttime Circadian Lighting Solution

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.

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 have a dimmable capability to dim to zero blue. This removes the sky-blue spectrum and creates a warmer atmosphere that promotes natural melatonin production and better sleep.

Biological Benefits

  • Increase Alertness
  • Enhance Productivity
  • Boost Mood
  • Promote A Better Nights Sleep


  • 0.83 Daytime Melanopic  Ratio
  • 83 Daytime CRI
  • AC-120V / 60Hz
  • Standard E26 white base
  • Brightness: 720 lumens
  • Light color 1900K – 3500K
  • Estimated life (based on 3 hours/day):  13.7 years
  • Estimated Energy cost:  $1.08 per years


To check out what dimmers are compatible, please click here.

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SKU: DBB-835-A21 Categories: ,


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  • Do they work in 220-240V countries?
    • No, they only work in 110-120V countries at this time.
  • Do they come in different sizes?
    • Not at the moment.
  • What if you don’t have a dimmer?
    • SkyBlue® A21 is made to transition from daytime operation to nighttime operation via a standard LED dimmers. If no dimmer is available, it will only operate in daytime mode.
  • What if  I have more than one light switch?
    • SkyBlue® A21 will work with 2-, 3-, or 4-way switch configurations as long as one of the switches is configured with an LED dimmer.
  • What kind of dimmers do you recommend?
    • SkyBlue® A21 is compatible with all standard LED dimmers and some standard incandescent dimmers. To check out what dimmers are compatible, please click here.

Additional information

Weight 1 lbs
Dimensions 6 × 6 × 3 in


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