Tungsten film has much more infra red light in it (compared to visible light) than daylight does. Hence it's effective film speed is higher under tungsten lights (see tech data sheets at eastman website). And strobelight is (generally) more rich in ultraviolet (which is why many manufacturers sell uv filters with their heads) and lower in infrared.(posted 8872 days ago)Ultimately, the answer is to do some careful testing with your equipment, before pursuing important imagery... t