Light photons are considered mass-less. The gravity bends light due to its relativistic mass. But this innovative paper and the author's previous papers referred in this article, reveal that, the light photons have rest-mass: Its rest-mass remains as it is at its speed c. How it happens is also explained w.r.t. Author's previous paper given in below description (The Light Photon, Black Matter...). All experiments performed give speed of light w.r.t. its source and not w.r.t. the observer. Not any experiment give speed of light w.r.t. observer. The speed of light w.r.t. observer decreases as the relative speed between the observer and the source of light increases. If the relative speed is v then the speed of light w.r.t. observer is (c2-v2)1/2. It is proved here. Experiments are also performed to verify the speed of communication radio waves; and it is declared that, the radio waves also travel at speed of light. But actually deep perusal of those experiments will reveal that, all those experiments give the speed of light of the source electrons which are free in conduction band of either field-radiating conductors or field-signal-receiving conductors. But, as verified by the author, in the experiment described in this article; the speed of radio waves up to Microsoft frequencies is infinity in free space. But, from infra-red above frequency radiations they travel at light speed in free space. These radiations consist of discrete, ultimate, eternal Dark Energy Particles in periodical bunches called photons known as Bosons. These photons are released from excited orbital electrons of an atom electro-magnetically. And hence, take it granted for that, Light is not electromagnetic radiation but, it is emitted electro-magnetically. There is a lot of difference in these two nomenclatures of the light on the basis of generation of the light. Lastly, there are two modes of transmission of energy by electromagnetic phenomena; the Field-Mode and the Photon-Mode, quite different from each-other.