Woputne Desk Lamp Clip Light, 10 Dimmable Brightness 3 Light Modes Reading Light, Clamp Bedside Lamp for Gaming, Painting, Craft, Study, Video Conference(Black)

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Brightness depends on resistance in a sense: if you know the resistance you can calculate power from voltage or current. However, perspectives are changing with the constant evolution of LED technology, which offers lower wattages without sacrificing lumens, or brightness.

You could also consider using reflectorized bulbs which focus the light in one direction, producing a much stronger beam with the same wattage.

It's quite common to be confused about these differences, and because of it to potentially make an uneducated decision. In Figure(A) as the variable reaistance increases its reaistance, the current which flow through the lamp will decrease and therefore its brightness decreases. The lightbulb lumens to wattage chart below will help you understand which LED bulb is comparable to your current incandescent bulb.

Tips: USB reading lamp, No mains; Clamp lamp can be powered by USB socket, power bank or laptop; And led lamp consume less power, suitable for kids, student (dormitory); The power button glows with a tiny blue light to make reading light easier for us to find.

Look for something around 3000K; if the CCT number isn't there, look for "warm white" as opposed to "cool white".