Are book lights worth it?

This is the one to buy if you are choosing without knowing much about the person. It is a clip light, so it works on a hardcover, a paperback, a Kindle or the edge of a music stand, and the 4.3-inch horizontal head means the beam covers a full page width rather than a hot circle in the middle of it.

The reason it scores highest here is disclosure. Six of our seven checklist items appear on the listing, including the two the rest of the category skips: brightness expressed in lumens rather than as a number of dots on a button, and both ends of the runtime range. Ninety hours is the lowest of five brightness settings; twelve hours is the brightest. Somebody reading a chapter a night at a middling setting sits between those, and knowing that is worth more than the ninety-hour headline.

The listing also mentions gift packaging and a bookmark in the box, which matters more than it sounds when the thing is going under a tree rather than into your own nightstand drawer. It is one of very few in this search that says anything at all about how it arrives.

Weight is the one blank. Nobody in this category publishes it, which is mildly irritating for a device that clips to a paperback cover, but it is not a Glocusent failing so much as a category one.

This is the older, plainer Gritin: nine beads instead of nineteen, a 1000 mAh cell instead of 1200, and no Kelvin values anywhere on the listing. It is the one that has been selling in this category for years and it is the reason the category looks the way it does.

The one thing it does that its bigger siblings do not mention is stand up by itself — there is a non-slip base, so it works as a small desk lamp as well as a clip. For a bedside table with no lamp on it, that is a genuinely different use.

It sits low here on disclosure, not on function. Three unnamed color modes and an unnamed charging port are two blanks on a seven-item checklist, and both are things the newer models publish.

A neck light is a different object from a clip light and the two are not interchangeable. It hangs around the neck and points two heads down at whatever is in your lap, which means it works on a book, a tablet, knitting, a jigsaw, and a paperback held one-handed under a duvet. Nothing clips to anything, so nothing has to be re-clipped every time you change position.

The hundred-hour figure is quoted for single-head mode at what the seller calls standard reading brightness, which is a more honest way of putting it than most of this category manages. Run both heads bright and it will be a fraction of that. Still, on the published numbers it outlasts everything else here by a wide margin.

The 90-degree beam is the detail that decides whether this is a good gift for someone with a sleeping partner. A wide beam lights the whole bed; a narrow one lights the page. Glocusent publishes the angle, which is more than most sellers do.

The trade-off is that some people simply do not want to wear a device. There is no way to know that in advance about someone else, which is why this sits below the clip light as a blind gift even though the numbers are better.

Five hundred milliamp-hours is less than half of what the bigger lights in this guide carry, and that is the entire design decision. This one is meant to fold flat and live in a bag, not to sit on a nightstand for a month between charges.

The articulation is the best of any clip light here — the head tilts down and swings both ways, and the clip itself rotates 150 degrees — which is what you want when the surface you are clipping to is a tray table rather than a book.

Brightness steps are published as percentages rather than as unnamed notches, which is a small honesty and makes the 10-to-80-hour range interpretable: eighty hours is the ten-percent setting.

Six of seven checklist items published, and the two it gets that almost nobody else does are the ones you would actually want before buying: it weighs about 1.3 ounces, and the clip opens to 0.8 inches. That second figure is the one that tells you whether it will grip a hardcover cover board or only a paperback, and it is the single most useful number on any listing in this category.

What it does not publish is Kelvin values. Three modes described as warm, neutral and cool tells you the shape of the thing but not where the warm one sits — 1800K amber and 3000K warm white are both described as warm and look nothing alike at midnight.

It comes as two lights in one box, which is a genuinely different gift proposition: one for the nightstand and one for the bag, or one each for two people. At the small end of gift budgets that is a real advantage over a single better-documented unit.

Runtime is the weak number. Thirty hours on the lowest warm setting is a third of what the Glocusent claims, and it is the honest ceiling rather than the flattering one — brighter and cooler modes run shorter, which the listing says out loud.

The idea is good. A thin illuminated panel that lies flat across the page is a different answer to the same problem, and for anyone who finds a clip light's beam too directional it is worth knowing the format exists.

The listing is the problem. Five feature bullets, of which the first is the sentence 'High quality book light for reading'. There is a 1200 mAh battery and a timer mentioned in the title, and no runtime, no Kelvin values, no charging port, no weight and no warranty anywhere.

We include it because the format deserves a mention and because leaving out the badly documented options makes the well documented ones look less remarkable than they are. Three of seven checklist items is the worst disclosure score in this guide by a wide margin.