How to choose Desk Lamp

In daily life,to use Desk Lamp is just for some specifically dot,such as before desk,
long-playing reading and writing even work.But do you know how to choose suited Desk Lamp?
Now we will share some recipes with you:
1.Avoiding swimmy light.
2.Choosing high frequency electronic compose organ.
3.Freely adjusting angle whether or not.
4.If baffle-board has excellent match light effect.
Those four points above could be as a reference when we choosing a Desk Lamp.