An advantage and a disadvantage, there are:

The great advantage of this lamp:
It is absolutely free of electromagnetic pollution - in the on and off state - I measured it there.
That's important to me because it is close to the head (at your desk or on the nightstand).
The disadvantage of the lamp:
Your battery is low on your chest and you have to reload soon, especially if she burns the highest brightness level.
This should be improved.