Hair color looks different at home because of lighting. Warm bulbs around 2700K make blondes brassy and dark hair warmer, while cool bulbs at 5000K make hair look ashy. Check your color under 3500-4000K lighting with a CRI of 90 or higher, plus natural daylight, for an accurate read.
Have you ever left the salon loving your hair color, then got home, looked in the mirror, in the bathroom mirror, and thought, why does my hair look yellow? You know, here's something that most people don't know is that light bulbs have a color temperature measured in Kelvin. That's actually the K on the box. So look at the box that your bulb came in. You'll usually see a number like 2700K, 3000K, 4000K, or 5000K. So if your bathroom has a 2700K or a 3000K bulb, Those bulbs are designed to give off a warm, cozy light. Beautiful for ambiance, but not so great for judging your hair color. That yellow light can make blonde hair look more golden or brassy and can make brunettes and reds look warmer. Then you walk outside and suddenly your hair looks completely different. And on the other end is that really cool bulb bulbs, especially like 5,000K and above. They give off this bluish light that can make your hair look ashier than it really is. So here's the catch. A lot of those are labeled daylight on the box, and daylight branded does not mean color accurate. So if you want bathroom lighting that's better for judging your hair color, your makeup, your skin tone, here's what to look for: around 3,500K to 4,000K. And here's the second number almost nobody knows how to check. It's the CRI. CRI stands for Color Rendering Index. Think of it as your light bulb's truth score. You know, the closer it is to 100, the more accurately you see color under that light. So look for a bulb that says CRI 90 or higher. That's it, 2 numbers: 3,500 to 4,000 Kelvin and CRI of 90 or higher. That's your beauty pro shopping tip. And if you've ever questioned your hair color at home, check it in more than one light, especially natural daylight near a window, because sometimes it's not your hair color that's changing. It's the light that's changing what your eyes see.
