Here’s a summary from Lightworkers.org.

“A LightWorker is anyone who chooses to be a channel between heart and mind, heaven and earth… There are many theories put forth as to what it means to be a LightWorker, from those who have the ability to work with unseen energies, such as Chi, to incarnated wanderers from distant universes and planar dimensions. The answer to this question can only come from within, when you sit in peaceful contemplation, and can search the depths of your heart for your inner truth.”