The tungsten lamp was suitable for transmittance of wavelengths between 320 and 1000 millimicrons; the hydrogen lamp for 220 to 320 millimicrons, and the mercury lamp for checking the calibration of the spectrophotometer.
12.
Another, major departure from the VL1 and VL2, was the use of a custom-made, tungsten lamp as the light source, which ran at a maximum of 53 volts and consumed 475 Watts.
13.
More-subtle filters are needed to correct for the difference between, say 3200 K and 3400 K tungsten lamps or to correct for the slightly blue cast of some flash tubes, which may be 6000 K.
14.
Despite allowing lighting designers and programmers to create the kind of gradual colour changes and soft-edged washes which were unachievable with the VL1 and VL2, the VL3 was not a long term success; mainly due to the tungsten lamp not being bright enough to handle longer throws, especially when set in darker colours.
15.
The piece on the picture was built in Hungary in the 70's ( by Tungsram ) and have completely disappeared from the market after the regime shift of'89 . ( And just hung up the sales guy at " GE Lighting " who said that the probability of it ever manufactured again is zero since all the misc parts [ glass, metal parts ] will be discontinued due to new EU regulations over tungsten lamps.
