Bask in the warm or cool glow of your room
The Kelvin scale is used to measure the temperature and color of light.
Warm light is low on the Kelvin scale and produces a soft glow that has calming effects and creates a cozy space.
Cool light is higher on the Kelvin scale and creates a blue tint that increases your productivity and alertness.
Choosing between warm and cool lighting for your home comes down to more than just aesthetics—your choice can have a significant impact on your mood and the functionality of your room. Whether you’re looking to elevate a cozy ambiance for relaxing or create a vibrant space for productivity, making the right lighting choice can affect your end result. Navigate the differences between warm and cool light to ensure you find the perfect choice for every room in your home.
To understand the differences between warm and cool light, you’ll need to know more about the Kelvin scale. The Kelvin scale is used to measure the temperature and resulting color of light.
The scale represents how the color of heated metal changes as temperatures are increased. It starts at red, then goes to yellow, and then blue. Therefore, the higher the temperature, the cooler (or blue) the light will appear.
The scale starts at 0, or absolute 0, and does not go into the negatives. Higher Kelvin temperatures around 4,000K to 5,000K produce a cooler light bulb color, while warmer light bulb colors register lower on the scale around 1,900K to 3,000K. Lights above 5,000K are daylight or natural light.
Some other common light temperatures include:
Candlelight at 1,900K
Direct sunlight at 4,800K
A blue sky at 10,000K
Knowing how to read the Kelvin scale helps you understand the color that each type of light emits. Warm lights have a red, orange, or yellow tone. They feel much cozier and softer to the eye. Cool lights give off a white or bluish hue, making them appear brighter and crisper than warm light.
Warm and cool lights have many differences including their color, health effects, bulb options, and the rooms they’re best suited for. Take a glance at their features side-by-side:
| Feature | Warm Light | Cool Light |
|---|---|---|
| Color | Red, orange, yellow | White, blue |
| Health effects | Calming, comforting | Alertness, focus |
| LED bulbs | Yes | Yes |
| Incandescent bulbs | Yes | Yes |
| Filament bulbs | Yes | Yes |
| Fluorescent bulbs | No | Yes |
| Location | Bedroom, living room | Kitchen, office |
Warm and cool lights have different effects on your health. That’s why it’s important for them to be placed in the correct places and used at the correct time to ensure they have a positive impact.
Warm lighting can make you feel drowsy and tired as it increases melatonin production. It’s very comforting and is best used in areas where you want to relax and feel calm. For example, a candle or fireplace both emit a warm light and add a relaxing feel to a room.
Cool lights can disrupt your body’s circadian rhythm. They can negatively affect your sleep as they suppress your production of melatonin due to their shorter wavelengths. Cool lights will make it harder for you to relax and get a good night’s sleep. On the other hand, they can boost your productivity during the day by increasing your attention, reaction time, and focus.
Due to the effects on your circadian rhythm, warm and cool lights are better suited for different areas of your home:
Bedrooms: Warm lighting is the best choice since it helps you relax and wind down, resulting in a better night’s rest. Warm lights are especially suited for night lights or lamps on a nightstand.
Offices: Cool light is usually best since it helps you stay alert, focused, and productive. It’s also beneficial for video conferencing as it creates a clearer picture than warm light.
Kitchens: Many homeowners opt for cool light in the kitchen. Due to its brightness, it helps the kitchen feel clean and modern and ensures you have high visibility when cutting and cooking.
Bathrooms: If you want your bathroom to feel calming and relaxing for warm showers or baths, go with warm lights. If you’re looking for bright effects to assist with makeup application, shaving, or other tasks, cool light is probably best.
Dining rooms: Warm lights will make your dining room feel cozy and relaxing. This is ideal for creating inviting family dinners or hosting events.
Patios: Outdoor areas are often illuminated best with warm lights. They provide a soft glow to the area that makes it feel warm and inviting. However, if you have an outdoor area where flood lights or motion-activated lighting is needed, cool lights will provide the best illumination.
The type of light bulb you purchase will have an effect on the color it produces:
LED bulbs: LED bulbs have a range of available colors. They use the smallest amount of energy and usually come with smart light features. You can select or program the color temperature you’re searching for.
Incandescent bulbs: These bulbs give off a soft, white light that typically falls in the middle of the Kelvin range. They are often the standard choice for household bulbs.
Fluorescent bulbs: Fluorescent bulbs emit a bright, white, or even blue-tinted cool light. They are often used in offices, schools, and hospitals as they increase alertness.
Filament bulbs: Filament bulbs produce an orange-tinted warm hue. Their design is based on vintage light bulbs and they give off an antique, comforting feel.
You can also determine whether a bulb is warm or cool by checking the Kelvin rating on the packaging. Bulbs with a measurement of under 3,000K will provide a warm light, and bulbs over 3,000 K will give off a cool light.
Now that you’re equipped with the knowledge of warm vs. cool lights, you’ll be able to choose the best option for each room of your house. Warm lighting will provide a comforting ambiance in relaxing spaces, and cool lights will increase attention in task-focused rooms.
Consider hiring a local light fixture technician near you to help with the installation of your new lighting. They’ll be able to answer any questions you may have and complete the installation with ease.
The four main types of lighting are ambient, task, accent, and decorative.
Ambient lighting is the dominant lighting in a space
Task lighting helps to illuminate an area where you perform certain tasks
Accent lighting adds character to a room
Decorative lighting adds a decorative touch to the space
When it comes to eye health, warm light is much better for you than cool light. Cool light is harsher on the eyes and causes strain. If you’re working in cool light, you may want to consider wearing blue-light glasses to protect your eyes.
