Both a foot-candle and a foot-Lambert are equal to 1 lumen per square foot. The foot-candle measures light that is incident on a surface while a foot-lambert is a measurement of light being radiated from a source. The problem with measuring a foot-Lambert is that the light reading sensor needs to be directly on the surface so that the reading is not affected by light fall off (1/d^2) where "d" is the distance from the source to the meter.
If you could find a Photo Research Lite Mate, or Sekonic L-246 (much cheaper) foot-candle meter you could read the ambient light (foot-candles), and, in theory, approximate a foot-Lambert reading by holding the meter cell without the integrating lumidisc against the CRT screen in the area you want to read.