Is it flicker free if I run tungsten lights off of it?

Flickering is typically caused by fluctuations in voltage. The RS5500 has excellent voltage control, so you should not see any flickering as long as you do not overload the generator. We recommend checking your wattage requirements on the lights to ensure the generator is the correct size for your needs as the inrush current from a tungsten light can be 10-20 times the rated current of the light.