Lighting

The problem is contrast, not darkness

A bright screen in a dim room is the whole issue, and it is worth being precise about why. OSHA’s computer-workstation guidance puts it directly: “High contrast between light and dark areas of the computer screen, horizontal work surface, and surrounding areas can cause eye fatigue and headaches.”

Your eyes keep re-adjusting between a luminous rectangle and a dark surround. The fix is not a brighter room or a dimmer screen — it is narrowing the gap between them. That is what all of this equipment is actually for.

Where the authorities disagree, and why

There is no single correct lux number for a desk, and any page that gives you one is picking a side without telling you. OSHA suggests 20–50 foot-candles for office work, rising to 73 foot-candleswhere LCD monitors are in use — roughly 785 lux by our conversion, and note OSHA publishes foot-candles, not lux. Canada’s CCOHS puts “performance of computer tasks” at 75–300 lux, and hedges its own general 300–500 lux office figure as “not a must” that applies only where no task lamp is in use.

Those are both real, both citable, and they do not agree. The reason is that the monitor is itself a light source, so the question was never “how many lux” — it is how well the desk brightness matches the screen brightness. We work through the whole thing here, conflict and all.

How the category divides

Monitor light bars clamp to the top of your screen and throw light forward onto the desk without hitting the screen. They solve the contrast problem specifically, and they are the right answer for most desks.

Desk lamps light the whole surface. Better if you work with paper, take video calls, or want the desk usable when the screen is off. The lamps that publish real specs are a small field.

Most people need one, not both.

The CRI problem nobody mentions

Every product here leads with a CRI number, and CRI is weaker than the marketing implies. Ra is an average over eight low-saturation test colours and it excludesR9 — deep red, the sample that matters most for skin tones. A lamp can average Ra95 and still render reds badly.

The stronger point comes from the CIE, the international body that defined CRI in the first place. They have published a position statement saying Ra “does not agree well with overall perceived colour rendering” for LEDs, that the problem is specifically bad for narrow-band LED sources, and that the metric needs replacing. CRI was first published in 1965 and last improved in 1974.

So every Ra>95 sticker on a 2026 lamp is a 52-year-old formula that the organisation which wrote it has said in writing is not fit for the light source it is being applied to. It is free to read; it is in our sources.

What the money buys

Honesty about the numbers, oddly. The most expensive lamp we looked at publishes a lowerCRI than the cheaper ones — and it is the better-documented product, because it is the only one that publishes R9 at all, and the only lighting brand on this site that cites an actual standard for its rated-life figure. Everyone else’s 50,000-hour claim rests on a single blanket FAQ line citing nothing.

Which is a good reminder that a bigger number and a better number are different things.

The mistake people make

Buying a light bar for a room that is already well lit. If your problem is not screen-versus-room contrast, this equipment solves nothing. And if you are on video calls, the requirement inverts entirely — you need light on your face, not on your desk, which is a different product.