0 0. kiper. A star's _____ brightness is its actual brightness and does not depend on where the star is viewed from. actually the square of the amplitude. There are two ways to describe a star's brightness. Lumens is the unit of measurement for the brightness of a bulb. For example, I believe that a 60 watt bulb gives 1300 Lumens of 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. b. amplitude. Brightness of bulb depends on both voltage and current. The brightness percept depends on the perceived reflectance of the surfaces. b. amplitude. d. speed. Brightness of a light bulb depends on the power, current, resistance and size of the filament. I was working through some questions on DC Circuits. When toggling between dark/light background the brightness will decrease/increase respectively. 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 the brightness seen by humans on Earth. So whether you increase the current or the voltage the brightness will increase. Since we know that Power (P) = Voltage x Current = V I . Relevance. So, the brightness in lumens is only the human detectable stuff. Lumens is the unit of measurement for the brightness of a bulb. Wattage is what determines the brightness of the light. A 50-watt bulb is not as bright as a 100-watt bulb. 1 decade ago. Pay close attention to lumens, since this number indicates the brightness, or light output, of the bulb. Suppose we increase the voltage more than labeled on it; would the brightness decrease, increase or remain the same? Favorite Answer. As where 100 watt bulb gives 1450 lumens. Likewise, what would happen if we decrease the voltage? Lv 4. Answer Save. Because the light appears to come from above, the visual system infers that the upper square is receiving more incident light than lower square. Summary: The brightness or intensity of light depends on the distance and amount of energy coming from the light source. short answer - the different guy is ideal. 4 years ago. c. wavelength. 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. Porky. It makes sense assuming that the number of photons would affect the brightness of light. For example, a 100 watt bulb is brighter than a 60 watt bulb. Brightness of a light bulb depends on the power, current, resistance and size of the filament. Stars look like they are tiny pinpoints of light when in reality, they are anywhere from 10 to 8 million miles in diameter. 4 Answers. I am confused as to on what factors does brightness of a light bulb depends. a. frequency. The brightness, or intensity, of light depends on its...? Lv 5. The brightness depends on power. Simply take your current incandescent watts and select the corresponding LED bulb equivalent on the lumens brightness scale. Stack Exchange Network. Lumens is the unit of measurement for that brightness. Does brightness of light depend on number of quanta in the light? To understand how bright a light … For a bulb with given voltage and power, on what factors would its brightness depend? For instance, a 100-watt light bulb is not necessarily brighter than a 40-watt light bulb. To save the most energy, choose the … 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. What would happen if we decrease the voltage more than labeled on it ; would the brightness or of... 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