The E3 can be turned on and off. You can't charge and run the E3 with a charger at the same time. The E3 pure doesn't have a switch.
The E3 Triple will run at low light while USB is charging. I don't know how healthy this is for the light.
If I try I get almost zero power to my charging unit. I don't think it's unhealthy for the parts, just blah.
@hippy started
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The E3 can be turned on and off. You can't charge and run the E3 with a charger at the same time. The E3 pure doesn't have a switch.