Ring Lights: The Spec That Actually Matters (It’s Not the Diameter)
The ring light market is full of listings that lead with diameter. “18-inch ring light.” “26cm LED ring light.” “Dual 12-inch ring lights.” This is a red herring. Diameter tells you how much space it will take up on your desk. It tells you almost nothing about whether it will produce good light.
Here is what I look at instead.
The spec that matters: colour rendering index
CRI — colour rendering index — measures how accurately a light source renders colours compared to natural daylight. The scale runs 0 to 100. Natural daylight is 100. A CRI of 90+ means the light is rendering colours close to how they actually look. A CRI of 75 means your foundation looks one shade in your ring light and noticeably different in the bathroom mirror and different again outdoors.
Most budget ring lights do not advertise their CRI because it is low — typically 75-80. The listings that do advertise it are usually the ones worth buying. Look for CRI 95+. This single number matters more than diameter, wattage, or the number of LED beads.
The second spec: colour temperature range
You want a ring light that covers at least 3200K (warm, soft) to 5600K (daylight, neutral). Single-temperature lights lock you into one look. The 3200K end is useful for video with a warm feel. The 5600K end is what you want for accurate makeup application — it most closely replicates the light you will encounter outside.
The dimmer quality matters here too, same as with Hollywood mirrors. A ring light that flickers at 40% brightness is unusable for video. Test it on camera before keeping it — camera sensors catch flicker that the eye misses.
What I currently use and recommend
The Neewer 18-inch ring light kit (the one with the phone holder and adjustable stand) hits CRI 95+, covers 3200K-5600K, and the dimmer is genuinely smooth across the full range. At around €60-75 it is not the cheapest option, but it is the cheapest option that does not produce colour-inaccurate light. I have had mine for fourteen months. Nothing has failed.
If your budget is strictly under €40, buy the smallest ring light you can find with a published CRI spec rather than the largest one without one. Size is vanity. CRI is function.
Here is what I can tell you that the product page won’t: the cheap ring lights with no CRI spec all look the same in the promotional photos. They are not the same on your face.
