The Effect Of Lighting on Your Health
When it comes to improving your home, the list of projects can feel endless — swapping out furniture, renovating the kitchen, or finally addressing that one neglected corner you've been walking past for years. These are all worthwhile pursuits, but they share a common drawback: they tend to cost a significant amount of time, money, or both.
In my experience, there is one change that consistently makes a remarkable difference without touching either. Today's topic is lighting — and more specifically, the bulb rather than the fixture.
If you've ever stood in the lighting aisle feeling paralyzed by the sheer number of options, you're not alone. But there is one number worth focusing on above all others: Kelvin. Kelvin measures the colour temperature of light — the lower the number, the warmer and more amber the light appears; the higher the number, the cooler and more blue-white it becomes. It may sound like a minor detail, but consider the difference between the harsh fluorescent lighting of a hospital and the soft, warm glow of a candlelit restaurant. Same activity — being in a room — entirely different feeling.
That difference isn't just aesthetic. It's biological. Light has a direct effect on your circadian rhythm, the internal clock that governs your sleep, alertness, and mood. Higher Kelvin bulbs mimic the quality of daylight and signal to your brain that it's time to be alert and focused — making them well-suited to offices, workshops, or task-oriented spaces. Lower Kelvin bulbs, on the other hand, replicate the warmth of a candle or a setting sun, cueing your nervous system that it's safe to wind down.
This matters more than most people realise. A high Kelvin bulb in your bedroom or living room can quietly keep your mind in an activated state when your body is trying to rest. Over time, that mismatch can contribute to increased anxiety, restlessness, and difficulty switching off — all of which carry real consequences for your physical health.
A note of transparency: I'm not suggesting that changing a light bulb will resolve any mental or physical health challenges. But environment shapes behaviour, and the right lighting can meaningfully support the conditions your mind and body need to recover.
The next time you find yourself in the lighting aisle, pause and think about the room you're buying for. It's a small decision that, in my experience, reliably makes a large difference.
If you would like to talk more about lighting or any other design questions, please reach out through my contact page to set up a call and I will be happy to help in any way I can.
Thank you!
Skylar Holman – Spirit Design Studio