The most common type of floodlight is the metal-halide lamp, which emits a bright white light (typically 75-100 lumens/Watt). Sodium-vapor lamps are also commonly used for sporting events because they imitate daylight conditions, and colors appear natural.
They have a very high lumen-to-watt ratio (typically 80-140 lumens/Watt), making them a cost-effective choice when certain lux levels must be provided.
Conventional Energy:- Those sources of energy, which have accumulated in nature over a period of millions of years and cannot be quickly replaced when exhausted are called non-renewable sources of energy. This non-renewable source of energy is also called a conventional source of energy. Conventional sources of energy include natural gas, coal, petroleum, electricity (Nuclear, Thermal & Hydro Power plants).
Non-Conventional Energy:- Non-conventional sources of energy are renewable resources of energy like biomass, solar energy, wind energy, tidal energy, etc.
In nuclear power plant the graphite is used as a moderator. The job of the moderator is to absorb some of the kinetic energy of the neutrons to slow them down. This is because slow neutrons are more easily absorbed by uranium-235. A neutron slowed In this way can start the fission process.