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An August 1954 SMPTE Journal paper "CBS Color Television Staging and Lighting Practices," (which referrerd to the newly adopted NTSC system using either TK-41s or the Chromacoder) said that a "tattle-tale gray" must be used in place of the light blue or tan fabrics used in black and white. The reflectance suggested is 60%. [For those too young to recall, "tattle-tale gray" was an advertising phrase for something to be avoided by use of a certain brand of clothes-washing detergent.]
This article also explains that incandescent lamps can be dimmed about 30% by reducing the voltage from 120V to 110V, which incidentally reduces the color temperature by about 100K and increases the life by about four times. The article claimed that image orthicon color cameras could be white balanced succesfully with incandescent color temperature as low as 2300K.
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