CENTRIC DAYLIGHT™ Full Spectrum Flicker-Free A21 15W LED Bulb
CENTRIC DAYLIGHT™ Full Spectrum Flicker-Free A21 15W LED Bulb
CENTRIC DAYLIGHT™ Full Spectrum Flicker-Free A21 15W LED Bulb
CENTRIC DAYLIGHT™ Full Spectrum Flicker-Free A21 15W LED Bulb
CENTRIC DAYLIGHT™ Full Spectrum Flicker-Free A21 15W LED Bulb
CENTRIC DAYLIGHT™ Full Spectrum Flicker-Free A21 15W LED Bulb

CENTRIC DAYLIGHT™ Full Spectrum Flicker-Free A21 15W LED Bulb

4006.50  - In Stock

Regular price $29.00 Sale

  • New product! (July 2021)
  • Available in 4000K, 5000K or 6500K
  • Completely flicker-free light output (Learn More)
  • Full spectrum, 95 CRI light quality (Learn More)
  • Compatible with global voltage input (AC90-240V/50-60Hz)
  • Conveniently screws into any standard E26 Edison socket
  • 15 Watt power consumption
  • 1600 lumens - equivalent to a 100W incandescent bulb
  • Not dimmable, not suitable for enclosed fixtures
  • 25,000 hours lifetime, 3 year warranty

Notice: This item cannot ship to California. (Why not?)

  • Product Overview

    Waveform Lighting's CENTRIC™ line of LED bulbs are now available in a super-bright 1600 lumen (100 watt equivalent) configuration! CENTRIC DAYLIGHT™ LED bulbs provides light output that is free of optical flicker and a full spectrum color that approximates that of natural daylight. If you are looking for more natural daylight but are limited by geography, season or window placement, these bulbs will give you light that is both healthy and energizing.

    Flicker-free light output means that the rays of light emitted by the bulb are constant and uninterrupted, so you can rest assured knowing that the negative health effects such as headaches, fatigue and eye strain - previously associated with artificial lighting such as fluorescent lights and early LED bulbs - are eliminated.

    With a 4000K/5000K/6500K 95 CRI rating and a high R9 of 80+, the light spectrum emitted by CENTRIC DAYLIGHT™ bulbs is a full and complete spectrum that provides bright, white light that matches morning sunshine (4000K), noon sunlight (5000K) or noon daylight (6500K).


  • Product Specifications

    Specifications Overview
    Color 4000K, 5000K or 6500K
    CRI (Ra) 95+
    CRI R9 80+
    Brightness 1600 lumens (100W equiv)
    Voltage AC90-240V, 50-60 Hz
    Power 15 watts
    Installation E26 (Medium Edison Screw)
    Specification sheet download   Specification Sheet 
    Specification sheet download   4000K Photometric Report
    Specification sheet download   5000K Photometric Report
    Specification sheet download   6500K Photometric Report
  • Installation

    This product is a standard A21 LED screw-in lamp designed to work in virtually all lamp fixtures, including those designed for traditional incandescent or CFL lamps.

    The lamp has an industry-standard E26 base, which is the ubiquitous, approximately 1-inch wide, screw-base.

    The lamp emits the equivalent brightness of a 100 watt incandescent bulb, but only consumes 15 watts. You may find that your lamp fixture has a warning regarding the maximum wattage permitted per socket. Use the 15 watt value, and not the 100 watt equivalency value, in confirming compatibility.

  • Pricing & Ordering Information

    Listed pricing is per one bulb (1-pack) or six bulbs (6-pack). Please see below for part numbers and corresponding specifications.

    Part Number Specification
    PN 4006.40 4000K
    PN 4006.50 5000K
    PN 4006.65 6500K
  • Shipping & Returns

    This item is in stock and typically ships within 1-3 business days. Shipping is free within the USA.

    If you're not 100% satisfied with the performance, color or quality of your product, we'll work with you to make it right.

    Simply contact us within 30 calendar days after delivery and we'll pay for return shipping (USA only) and offer you a full refund.

    See our delivery policy, returns & refunds policy and warranty policy.

Choose Your Daylight


Our CENTRIC DAYLIGHT™ bulbs are offered in a range of color temperatures. 4000K provides a warmer, softer white that matches the shade of morning sunshine. 5000K has a more balanced, noon sunlight color, while 6500K provides a crisp, high-energy light similar to what you would see from a north-facing window.

All color options provide 95 CRI, full spectrum light that very closely matches natural light.


Choose Your Daylight


Our CENTRIC DAYLIGHT™ bulbs are offered in a range of color temperatures. 4000K provides a warmer, softer white that matches the shade of morning sunshine. 5000K has a more balanced, noon sunlight color, while 6500K provides a crisp, high-energy light similar to what you would see from a north-facing window.

All color options provide 95 CRI, full spectrum light that very closely matches natural light.


Flicker-Free & Healthy


Some LED lights will produce rapid flicker or pulses that aren't immediately visible to the naked eye, which can cause headaches, nausea and eye strain. Our CENTRIC SERIES™ products include additional electrical circuitry to achieve a truly flicker-free light output that produces a comfortable and stable light level. Learn more about flicker here, or watch our video demonstration below.

Full Spectrum & 95 CRI

CENTRIC DAYLIGHT products offer true full spectrum light, as measured by the Color Rendering Index (CRI) and CRI R9 metrics. With a 95 CRI, 80+ R9 rating, our lamps offer the closest reproduction of natural light in the industry.

  • Frequently Asked Questions

    • What is the difference between 4000K, 5000K and 6500K?

      These color temperature options correspond to the various shades of natural light. 4000K is similar to the warmer and softer shade of morning sunshine. 5000K approximates the bright sun during mid-day, while 6500K is most similar to the crisp, blue color of the sky.

      The choice between these colors is completely up to you! There is no correct answer, and this is a question of preference.

      Regardless of your choice, all color options feature 95 CRI and flicker-free light output, which will provide you with all of the benefits of full-spectrum light.

      Below are some articles that go into further detail:

      Difference Between 5000K and 6500K

      An In-Depth Look at 4000K

      4 Things to Consider Before Buying 6500K Bulbs

      Still not sure? Take advantage of our 30 day free-returns policy to try out the different colors. If you don't like it, simply let us know and we'll send over a return label.

    • Should I get warm white (2700K or 3000K) bulbs instead?

      The most popular color temperature option for home and residential use is either 2700K or 3000K, commonly labeled warm white. These are the color temperatures that match the warm and inviting glow of traditional incandescent bulbs. 

      Keep in mind that the CENTRIC DAYLIGHT™ product does not feature warm white color temperatures, but daylight white colors, designed to match natural light, and not incandescent bulb colors. You will find them to be more of a true white color, providing you with light that is crisp and energizing. You may also find that they do not "mesh" well aesthetically with other warm white bulbs in your home.

      If you're looking for a bulb that produces a softer, incandescent-like glow, we would recommend our CENTRIC HOME™ product line, which offers the same 95 CRI and flicker-free performance but with warm-white color temperatures.

    • Do these bulbs emit blue light?

      Yes, they do!

      You may have read or heard about the concerns regarding the blue light hazard. Excessive blue light exposure during evening hours is certainly a concern, but blue light is an essential and important part of our daily lives, as it is extremely abundant in natural daylight (the blue sky!) and an important signal to our bodies and circadian rhythms.

      CENTRIC DAYLIGHT™ bulbs are the industry's best approximation of natural daylight (95 CRI), and therefore contain similar relative levels of blue light in the spectrum as natural light.

      You can think of these bulbs as mini suns that you can turn on and off at the flip of a switch. If you are concerned about blue light during evening hours and the potential impact on your sleep, we would not recommend using these bulbs at night when the actual sun has already set.

      During the daytime, however, these bulbs are an excellent way to supplement or substitute for natural light.

    • How many bulbs should I install in my space?

      We generally recommend using one bulb for every 20 square feet of space. Simply divide the square footage of your space by 20 to get the number of bulbs needed. For example, a 100 square foot area would require 100 divided by 20, or 5 bulbs.

      While this may seem like a lot of brightness, do keep in mind that daylight color temperatures generally require a higher level of brightness for comfort due to a phenomenon described by the Kruithof curve.

    • Are these bulbs good for visual arts, scientific or industrial applications?

      These bulbs are a great fit for many applications that require a simulation of natural daylight.

      For technical or visual arts applications that depend on visual assessment and a closer adherence to international standards such as D50 and D65, we recommend our NorthLux™ Series A19 LED lamps.

    • Are these bulbs dimmable?

      Unfortunately, these bulbs are not dimmable. This means that they cannot be used on any electrical circuit which has a dimmer installed, even if you keep the dimmer at the maximum setting at all times.

    • Do these bulbs emit any UV radiation?

      These bulbs do not emit any ultraviolet radiation. The light output covers the entire visible spectrum between 420 nanometers and 800 nanometers, but does not go below (UV-A) or above (infrared).

    • What kind of lamp fixture can this product be used in?

      These A21 bulbs have a standard screw-in base (E26), which is the same type that has been used for more than a century.

      As long as the lamp fixture is designated for an A type or A21 type, these bulbs will be compatible.

      Although these lamps have the brightness of 100 watt incandescent lamps, these lamps have an actual power draw of only 15 watts. Therefore, they can safely be used in fixtures that have a max rating of less than 100 watts.

    • What is the voltage range of these lamps? Can they be used overseas?


      The voltage range of this product is AC 90-240V and 50-60 Hz, which covers all global voltages. As such, they can safely be used internationally without any issues. The internal circuitry adjusts for the input voltage automatically, and does not affect the light output or performance of the lamp.

Customer Reviews

Based on 22 reviews
Luc Renambot
Very bright and pleasing tone

Makes the office very bright and pleasing color when needed. More expensive but worth it.

We like it

My wife is very sensitive to imperceptible flickering in fluorescent and other LED lights. I thought I'd give this one a try and so have been pleased with the performance. My wife doesn't seem to have a problem with this LED. Will probably purchase more in the future.

Shiming Xie
Pricy but worth it!

One bulb was blinking after a few days light use for reason unknown. So I contacted the aftersale. New replacement was sent for free without question.

FYI, I dissembled the faulty one and found quality components used inside.

I will definately buy again.

Perfect for basement exercise room

I recently put a mini fitness center in my windowless basement. I exercise early in AM and decided to put in full spectrum bulbs for the health benefits of early morning natural light in the eyes and also had read about receptors in the body for blue and red light. These are great I ordered the 5000k and 6500k. The other half of the basement has regular bulbs and over there it looks very yellow and unappealing. (like urine after a vitamin).

Love the light

Very happy with my lightbulb. Bright, non flickering. Will be purchasing more for my office to keep the headaches at bay.

Great bulbs

These are much brighter than the a19 bulbs. If you have limited sockets these are the ones to get. Light from the 4000k bulbs appears closer to 4500k when compared to other brands but is still definitely warmer than 5k. Color accuracy is great according to my wife, and the high r9 helps me separate colors since im colorblind.

Kenny T
Great Bulbs

I'm glad there's finally higher wattage versions of the 10W high CRI bulbs. Sometimes you just need more light regardless of the colour temperature for things to look right.

The colour temperature consistency across bulbs is excellent, and the high CRI with low flicker is literally a sight to behold.

Nathaniel H
Good in general, but great with enough light!

OK, so I'm a bit picky about lights, or at least about color temperature. I like 6500k and not much anything less. I wish I could find a 7000k because I'm pretty sure I'd like it.

But I haven't historically taken note of color rendering. I figured I'd try a high CRI light to see if I could tell a difference, and I picked these.

Well, overall I thought it was a good light, but didn't really notice much improvement over any other 6500k light... Until I tried it in a lamp focused directly down on a work surface.

That gave me enough concentrated lumens that I finally... Uhh... Saw the light? and for days thereafter, every time I walked by I marveled at how fantastic anything under it looked.

So for me, I like these a lot, but it doesn't really kick in unless you've got a lot of concentrated lumens, so they're ideal in tight spaces or with a fixture that holds lots of bulbs.

Maybe I'll get a chance to try the LED strips sometime to really up the lumens.

Photographer’s delight

I needed clear white lighting for my photo editing workroom to check the color balance of finished prints. This 5000k, 95 CRI 1600 lumen bulb is perfect. I am tired of the obnoxious yellowish cast and dull color rendition of most bulbs I tried. I’ll be using these bulbs in many more places. Please make a bulb like this with 3200 lumens!

Elisabeth Mathias
Works for S.A.D.

Works on my seasonal affective disorder, I sit under this light for at least 45 minutes a day and my mood is consistently better. I might replace the whole house with these eventually. I purchased the 5000K model and the only criticism that's more my fault than anything, but 5000K is a bit more blue than I was expecting.

Regardless, great lights for my uses. Makes food look better too.