I want to buy a desk lamp to put in the dormitory, and I need soft light to protect my eyes. How to choose a desk lamp? What about the parameters? Also, how should the placement position protect the eyes? thank

In the current desk lamp, LED is better, although it will still be more expensive than energy-saving lamps or light bulbs, but it is worth it:

The selection of LED should have the following points:

First of all, look at the shape of LED beads, which must be patch (that is, there are many square yellow spots on an aluminum substrate). If it is a small spherical lamp bead or several high-power lamp beads, discard it decisively, because it is old-fashioned and bad for the eyes, but LED has not developed into a mature technology before;

Test whether there is no strobe with your mobile phone. Turn on the camera and aim at the LED light source. If the screen doesn't flash, there will be no strobe, and if it flashes, it will not work.

See if it's bright enough. Generally speaking, 4W is already very bright, but it can meet the above requirements, and this is basically no problem.

LED is the general trend:

First of all, it saves a lot of electricity than energy-saving lamps and light bulbs. Saving electricity means reducing calories, you know, in summer;

Then there is the security issue. Led doesn't need glass and won't break. Both light bulbs and energy-saving lamps have this defect, and the fluorescent powder in energy-saving lamps is toxic, which makes people hurt and troublesome.

Other benefits are secondary, and the most important ones are the above two.

As for dimming table lamps, incandescent lamps were used to dim the light at first, and then energy-saving lamps were used to dim the light (the structure of energy-saving lamps was not suitable for dimming, and some styles were introduced later, which were relatively expensive and stable, even for big brands). Up to now, LED dimming, like incandescent lamps, will be dark at low voltage and bright at high voltage (but LEDs need DC voltage), so the current LED dimming desk lamp is not expensive, even much cheaper than energy-saving lamps.

What's more, the low-priced rechargeable desk lamp on the market is too small for reading and only suitable for emergency lighting. Buy eye protection instead of rechargeable desk lamps. Even USB power supply is better than charging, at least there is enough power.

About placement: I can't help you if you want to talk about Feng Shui as long as it's not dazzling and the light is sufficient, hehe.

I hope I can help you.