For instance, a 100-watt light bulb is not necessarily brighter than a 40-watt light bulb. 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. actually the square of the amplitude. I am confused as to on what factors does brightness of a light bulb depends. Simply take your current incandescent watts and select the corresponding LED bulb equivalent on the lumens brightness scale. Since we know that Power (P) = Voltage x Current = V I . Favorite Answer. c. wavelength. It makes sense assuming that the number of photons would affect the brightness of light. For example, I believe that a 60 watt bulb gives 1300 Lumens of light. There are two ways to describe a star's brightness. Stack Exchange Network. Stars look like they are tiny pinpoints of light when in reality, they are anywhere from 10 to 8 million miles in diameter. Because the light appears to come from above, the visual system infers that the upper square is receiving more incident light than lower square. The brightness, or intensity, of light depends on its...? Porky. When toggling between dark/light background the brightness will decrease/increase respectively. 4 years ago. A 50-watt bulb is not as bright as a 100-watt bulb. Answer Save. b. amplitude. Suppose we increase the voltage more than labeled on it; would the brightness decrease, increase or remain the same? This is not tied at all to the lightning conditions of the room, and I've been able nail down that this only happens when two conditions are met (but it it 100% reproducible under these conditions) 1. A star's _____ brightness is its actual brightness and does not depend on where the star is viewed from. Does brightness of light depend on number of quanta in the light? To save the most energy, choose the … Relevance. So, the brightness in lumens is only the human detectable stuff. The brightness depends on power. So whether you increase the current or the voltage the brightness will increase. Brightness of a light bulb depends on the power, current, resistance and size of the filament. 4 Answers. 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. The brightness of a star depends on how much light is released by the star and how far the star is from Earth. Wattage is what determines the brightness of the light. d. speed. Lv 5. Lumens is the unit of measurement for that brightness. Likewise, what would happen if we decrease the voltage? Brightness of bulb depends on both voltage and current. For a bulb with given voltage and power, on what factors would its brightness depend? 1 decade ago. The brightness percept depends on the perceived reflectance of the surfaces. 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