IJESRT INTERNATIONAL JOURNA A Review on Illuminance Measuring Technique for Hassles Free Operation in

operations. Underground mines are completely dependent measuring of illuminance and [2 & 3]. If they are carefully designed and implemented, lighting systems provide mine workers improved visibility and contribute to improved safety and productivity. Effectively designed lighting systems can prove to be a very cost investment in underground mines. Instruments are required to evaluate lighting systems and components in order find out the illumination depreciation over time. The field of light measurement is called photometry, and the instruments used to measure lighting are called photometers [30 & 31]. All objects are seen by contrast, either dark against a light background or light against dark. Our ability to see them depends on this contrast, and we need more of it at lower lighting levels and when we need to see small detail. Unless the objects are self their contrast with the background comes from the amount of light directed at them which is returned to the eye [10]. LUMEN – THE POWER OF LIGHT The radiation or "luminous flux", which comes from a lamp, is measured in lumens allows for the fact that the sensation of "light" experienced by the human eye/brain system depends on the wavelength of the radiation entering the eye [10]. The same amount of energy at the opposite ends of the spectrum red and blue sensation than in the middle (yellow/green). At the peak of sensitivity one watt of radiated electromagnetic power is equivalent to 683 lumens. -9655 [240-247] -effective