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@am*3 wrote:

 

Light globes are warm white or cool daylight. When would you use cool daylight ones?. I just grab any and don't notice till I get home what I have chosen.

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Never in a house.

Old incandescents are  a very warm white (between 2300-2800k). When you buy a light it should say Warm White or it should be between 2700-3000k light temperature.

Cool White is between 3000-4000k.

Anything above 3000k I would specify for an office environment or a garage.

Anything above 4000k I would specify in a warehouse or a supermarket.

Many people think that they are getting a whiter, brighter light when the light is Cool White particularly if they are used to an old, barely functioning incandescent light. But it just looks artificial and not very nice on your furniture or on your skin.

And even worse is when people buy at 4000k light because it is labelled as 'Day Light' so they assume it will make their house all sunshine-y and bright. It doesn't.  It is a couple of steps away from the blue light they use to discourage addicts from shooting up.