Warm White vs Cool White Camp Light

"Warm" and "cool" describe the colour of white light. They don't say how hot anything is. Warm white looks yellowish, like a candle or an old bulb. Cool white looks bluish, like an overcast sky. That's the whole idea, and it's less mysterious than the marketing makes it sound.

What the labels mean

The scale is colour temperature, measured in kelvin (K). It's oddly backwards. Bluer light is called "cooler" even though it comes from a hotter source, in physics terms.¹

A lamp marked warm white sits at the low end. Cool white or daylight lamps sit higher.¹ Camp lights often print the number on the box or in the spec table. If they don't, the words warm, neutral and cool are the guide.

Mood and tasks

Warmer light is often used in public areas to promote relaxation. Cooler light is used to help concentration, for example in schools and offices.¹

At camp, that points one way. A warm light suits sitting around, eating and winding down. A cooler light may suit map reading or sorting gear. Beyond that it's taste. The source offers no rule, and neither will this page. Try both on a dim evening and see which one you'd rather sit under for an hour. The only claims here are the two the source makes: warmer light is often used to promote relaxation, and cooler light to enhance concentration.

Do bugs care?

Light affects living things differently depending on its wavelength, which is the colour.² Humans can't see ultraviolet light, but entomologists, who study insects, often use it to attract them.²

That's about as far as the sources go. They don't rank warm white against cool white for bugs, so this page won't either. Look at a light's spec sheet to see whether it gives off ultraviolet at all, and keep lights low and aimed down.

Reading the numbers

Some lights print a kelvin figure. The source's examples help you place it. Warm white compact fluorescent and LED lamps are listed at 3,000 K. Cool white or daylight lamps of the same kinds are listed at 5,000 K.¹ Treat those as landmarks, not promises. Makers label their own products, so two lights both sold as warm white can still look a little different side by side.

Picking one

• Warm white for the sitting area, if you want a calm feel.
• A cooler setting for jobs that need a clear look, such as checking a map.
• A light with both, if you want to change your mind.

Colour isn't brightness. For the brightness side, read about lumens and lux. Wanting your eyes ready for the dark is a different problem again, and red light at night takes it up.