Koze: Day 5000K A19
The verdict
A 4976K LED A19 bulb. Its color rendering is excellent (CRI 96, R9 91) and its body-clock signal is very high (86% of daylight).
One of the most accurate bulbs I have tested. A strong pick wherever color matters: kitchens, bathrooms, vanities and art.
CRI 96 · Rf 95
CRI Re, the average of all 15 samples (Ra 97). #22 of 84 white-light bulbs.
R9 91
Saturated red: skin, wood, food. 100 is perfect. #28 of 86 white-light bulbs.
4976K
Sold as 5000K. Gap from natural light 9% (very close). Tint +0.0052, close to neutral.
86% of daylight
Melanopic DER 0.86. Low is easier on sleep at night; high helps you feel alert by day.
The light
Measured spectrum, 380 to 780 nm, scaled to its peak.
How colors look
The red line pulls out where colors get more vivid and pinches in where they dull. Hover a bin for its numbers.
Where it ranks
Every white-light bulb I have tested, in its own light color. Left is warmer, up renders color more truly. Tap a dot to open that bulb.
This bulbOther bulbsFaded: discontinued
Truer color, same color temperature
Still sold, within 300K of this bulb, with a higher CRI.
GE Sun Filled 5000K A21CRI 98 · R9 88 · 5136KNorb Smile 5000K A19CRI 98 · R9 89 · 5257KYuji NormLite 5000K A19CRI 97 · R9 96 · 5254KSimilar bulbs
Still sold, near the same color temperature, same E26 base where one qualifies.
Specs
Power, brightness and efficacy marked "rated" are the manufacturer's numbers. I have not measured them yet.
- Brand
- Koze
- Model
- Day
- Type
- LED
- Shape
- A19
- Base
- E26
- Finish
- Plastic
- Power (rated)
- 9W
- Brightness (rated)
- 800 lumens
- Efficacy (rated)
- 89 lumens per watt
- Dimmable
- Yes
- Sold as
- 5000K
- Measured
- 4976K
- Gap from natural light
- 9% (ASD)
- Tested
- Feb 17, 2023
- Instrument
- Handheld spectrometer (before the integrating sphere)
- Status
- Available