I have a case of VL Criticolor-D F15T8 lamps. Does anyone know the kelvin temp. of these? I compared one side by side with a Phileeps Natural Sunshine 5000K and it is brighter and bluer than the N.S. lamp.

The Criticolor-D has a color temp of 5670K and a CRI of 90. I have a friend who has two of these of different ages, a 1970s Verd a ray 40w and a VL 35w energy saver from 1986. I lit them and the color appearance looks very similar to Duro-Test's Vita-Lite.

i wound up with a case of the f20t12 type.
they seem bluer than a vitalite.
my neighbor had c75 in his 2' shoplites and when they started dieing off i set him up with some of these.they seem pretty close to the(aged) ge c75.