In our recent publications it was reported about intensive field emission (FE) of electrons fron nano-carbon (nC) thin film materials grown by chemical vapor deposition (CVD) method [1,2]. The low threshold voltage of FE (less than 1.5 V/um), high density (more thatn 10^6 cm^-2) and distribution homogeneity of FE sites over the CVD film surface, and high density of emission current (more than 1 A/cm^2) allows application of the nC materials as highly efficient cold cathodes. One The main advantage of these electron emitters is lowest power consumption due to quantum tunnel mechanism of FE in comparison with usual incandescent cathodes. This advantage is crucial in application for various vacuum electronic devices utilizing electron beams. In this report a few prototypes of light emitting vacuum electronic devices based on nC cold cathodes will be presented. Extremelly high efficiency of energy conversation from electricity to light (more than 30%) was achieved for the lamps due to combination of excelent combination of characteristics of our nC cold cathodes and high efficiency of cathodoluminescent process. The possible application of the light emitting devices will be discussed as well as possible application of the nC cathodes in vacuum electronics. [1] A.N. Obraztsov, A.P. Volkov, K.S. Nagovistyn, et al., J. Phys. D: Appl. Phys., 35 (2002) 357. [2] A.N. Obraztsov, A.P. Volkov, A.I. Boronin, S.V. Kosheev, JETP, 93(2002)846.