Separate colour from brightness
A warm-looking lamp can be bright, while a neutral-looking one can be dim. Ask two separate questions: is the working area lit sufficiently and evenly, and do you like its colour appearance? Changing both at once makes it difficult to identify what improved the result. With an adjustable lamp, begin at a similar brightness while comparing colour settings.
Use a white sheet, a coloured print and an object you handle regularly. Examine them under the different settings without looking directly into the light source. Do not decide from a photograph of the lamp on a shopping page; the camera and your display can change its apparent colour. A trial at the actual workstation is especially useful where fixed ceiling lighting will remain part of the arrangement.
Notice the transition into the room
One pool of light can look distinctly different from its surroundings. Look beyond the desktop and try the normal movement of your gaze between screen, paper and room. If that transition feels distracting, test a setting closer to the surrounding lighting or change which combination of fittings is switched on.
For a desk in a living room, the preferred arrangement during the day may differ from one used for a brief evening task. An adjustable model provides flexibility if its controls are straightforward. Do not buy additional settings merely because there are many of them. What matters is reaching the setting you need easily and being able to restore it predictably after the lamp has been switched off.
Treat colour-critical work separately
If you must judge printed colours, fabric samples or other colour-critical material, choosing between warm and neutral light is not enough. Such work has task-specific viewing requirements that should be agreed with the relevant specialists. An arbitrary desk lamp does not make a comparison between a screen and printed output authoritative.
For everyday writing and screen work, a simple comparison is a useful starting point. Perform the same short task under each setting and record the specific problem: too little light on the left side of a sheet, a reflection on the display or an unwanted colour appearance. This turns a general preference into a reasoned purchasing decision without promising that one light colour will automatically improve concentration.
