With this power bank you can power your lamp for at least 6,5 hours. And even longer when you use a lamp with dimmer, slightly dimmed. It has a second USB outlet to charge your phone while playing; this second outlet cannot handle a second lamp though, for that its power is not sufficient. It comes with a short USB charging cable. 

Dimensions:  15.0 x 7.5 x 1.9 cm  Weight 315 Gram