It's only a little dimmer than a 2w led 230v bulb from the supermarket but honestly for the power draw on a 5v line it's really not that bad, definitely exceeds my needs and it's definitely a quality product, why buy solar lighting for emergencies when you could get a 30.000mAh type c power bank with a type C solar charger? Much more longer lasting.
Happy with the warm/cool switch, works well.