For a bulb with given voltage and power, on what factors would its brightness depend? Simply take your current incandescent watts and select the corresponding LED bulb equivalent on the lumens brightness scale. Favorite Answer. Does brightness of light depend on number of quanta in the light? This is very relevant today as newer light bulbs use less energy, so wattage is not a reliable measure of a light bulb’s brightness. A star's _____ brightness is the brightness seen by humans on Earth. d. speed. The brightness of a star depends on how much light is released by the star and how far the star is from Earth. A star's _____ brightness is its actual brightness and does not depend on where the star is viewed from. Lumens is the unit of measurement for the brightness of a bulb. Suppose we increase the voltage more than labeled on it; would the brightness decrease, increase or remain the same? Stack Exchange Network. To understand how bright a light … There are two ways to describe a star's brightness. So, the brightness in lumens is only the human detectable stuff. Relevance. 1 decade ago. Likewise, what would happen if we decrease the voltage? When toggling between dark/light background the brightness will decrease/increase respectively. Brightness of a light bulb depends on the power, current, resistance and size of the filament. Summary: The brightness or intensity of light depends on the distance and amount of energy coming from the light source. Since we know that Power (P) = Voltage x Current = V I . Lumens is the unit of measurement for the brightness of a bulb. It makes sense assuming that the number of photons would affect the brightness of light. b. amplitude. short answer - the different guy is ideal. 4 years ago. Porky. For instance, a 100-watt light bulb is not necessarily brighter than a 40-watt light bulb. A 50-watt bulb is not as bright as a 100-watt bulb. The brightness percept depends on the perceived reflectance of the surfaces. Brightness of a light bulb depends on the power, current, resistance and size of the filament. actually the square of the amplitude. For a typical light, much of this power would be in forms that are not detectable by a human eye—like stuff in the infrared spectrum. I am confused as to on what factors does brightness of a light bulb depends. b. amplitude. Wattage is what determines the brightness of the light. c. wavelength. Stars look like they are tiny pinpoints of light when in reality, they are anywhere from 10 to 8 million miles in diameter. Lv 5. To save the most energy, choose the … Brightness of bulb depends on both voltage and current. The brightness depends on power. Lumens is the unit of measurement for that brightness. So whether you increase the current or the voltage the brightness will increase. 4 Answers. For example, I believe that a 60 watt bulb gives 1300 Lumens of light. Lv 4. 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