5500K for the picture, just a little. If not, that's OK. The problem is that the 5500K does not exactly match the white balance of sunlight and moreover, a very small spectral imbalance probably easily recovered by software development. Format bulb really imposing. 10 cm diameter, 25 cm long! Finally I can use only one out of two, if not, too flat. Too soft shadows. The lamp is opaline, if more diffuse with an umbrella and eventually using 2 éclairagelatéraux equipment is hospital!