Galaxy projector or night light: which one does the job you need

A night light provides a small amount of general illumination so that a person waking in the dark can see the room — the edge of the bed, the door, the floor between the two. It is judged on whether it lights the floor without lighting the ceiling.

That is a low bar and almost any night light clears it. The differences between them come down to colour temperature, whether they are always-on or motion-triggered, and whether they are dim enough not to be a nuisance.

A projector throws an image onto a surface. It is judged on how that image looks: how dense the field is, how well the colours read, how cleanly it sits on the ceiling. It is a thing you look at rather than a thing you see by.

Crucially, a projection is designed to be dim. A scene bright enough to light a room would wash itself out — contrast is what makes it look like anything at all, and contrast means the rest of the room stays dark.

A projector does put some light into a room, and in a small bedroom that is occasionally enough to take the edge off complete darkness. Some people use one for exactly that and are happy.

But it is a side effect, not a feature. The light is coloured, uneven, and concentrated on the ceiling rather than the floor — which is the opposite of what a night light is trying to do.

In a child’s room the honest answer is usually both, and they do not conflict, because they run at different times. The projector goes on at bedtime while someone is awake and looking at it; a low night light or a plug-in sensor light covers the middle of the night.

If you only want one and the need is genuinely navigational — a child who gets up, a landing with a step — buy the night light. A projector will not solve that and no amount of tuning will make it.

It changes. A night light is the same every night for its whole life; a projector is a different room depending on which disc theme is fitted, and swapping one takes seconds. For a child that is the difference between furniture and a thing they engage with.

It also scales to the room rather than to a socket. A night light illuminates a corner; a projection covers a whole ceiling, which is a different kind of effect and the reason people put them in adult bedrooms and living rooms too.

Ask what happens if the room is completely dark. If the answer is "somebody cannot find the door", you want a night light. If the answer is "it is a bit boring in here", you want a projector.

Most of the disappointment with either product comes from having answered that question the other way round before buying.