According to the Inverse Square Law of brightness, the Apparent Brightness (B) of a source is inversely proportional to the square of its distance (d). As light rays emerge from a source, they spread out in an area. Emittance is a property of a charged particle beam in a particle accelerator.It is a measure for the average spread of particle coordinates in position-and-momentum phase space and has the dimension of length (e.g., meters) or length times angle (meters times radians). The brightness of a lightbulb is given by its power.P = I 2 R, and so brightness depends on current and resistance. If the bulbs are identical, they have the same resistance. The brightness depends on the square of the current and is directionally proportional to the power. The brightness B_\nu (more properly known as the specific brightness) is the intensity of a radiating source (i.e., the energy flux per solid angle per unit of frequency), also called the radiance or surface brightness. Brightness is a "subjective" quality of light. In MKS, it is measured in units of {\rm J\ s}^{-1}\ {\rm m}^{-2}\ {\rm Hz}^{-1}\ {\rm ster}^{-1}. For example the Sun gives out about 500 million million million MJ of energy every second so its luminosity is 500 million million million MJ. Luminosity is a measure of the total energy given output by a star at all wavelengths from gamma radiation to radio waves. One is to move your hand farther in the same amount of time, increasing the amplitude (tallness) of the wave (which is like the brightness of the light). Hence, there is a greater or wider area for the light to illuminate. The level of brightness in this instance is relatively bright. It depends on the perception of whoever is viewing the light. Dependent variable (1pt): Brightness off the light bulb (lumens) Predicted Relationship (1pt): Direct relationship Control Case (1pt): Voltage of 0v. Double the current and you have 4 times the brightness! Why Do We Not List Black and White as Colors in Physics?. Luminosity and brightness Luminosity. This led to a no brightness Background In this lab, we tested the relation between the voltage of a circuit and how it affects the brightness … For example in an 8 bit grayscale image there are 256 gray levels. The luminosity depends on: There are two ways of putting more energy into this. They may not, however, experience the same current.Therefore, when you are asked to rank the brightness of identical bulbs, you are really being asked to rank the amount of current through each. If you move your hand back and forth, that back and forth motion will travel along the string as a wave. Double the power and you have 2 times the brightness. The Apparent Brightness of a source is a consequence of geometry. 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