Sun, stars, planets, moon, light bulbs, fluorescent tubes, LEDs, sparks, LCDs, hot glowing metal.
No, Jupiter is not a source of light. It reflects light from the Sun, making it visible from Earth.
the sun
The magnitude of visible light is dependant on the strength of the source
A visible object that is not a light source is any other object in the universe. Objects that are not light sources reflect light and are thus made to be visible.Examples include:planetspeoplethe mooncarsdogsflowersbooksrocks, either in daylight, or else illuminated by a flashlighta light bulb or LED with the power switched off
They reflect and scatter visible light that comes from an external source.
A primary light source is one that actually produces light, such as a light bulb or the sun. A secondary light source in one that ONLY reflects the light produced by a primary light source. It doesn't produce light itself, such as a mirror or the moon.
a puddle or a rainbow
Most of the visible light spectrum except green wavelengths is absorbed by the chlorophyll molecule and is usable in photosynthesis as a source of energy for plants.
A lumen of light is a measurement of visible light. It means the brightness of light and can vary depending on the light source.
Visible light does not have watts as a direct measurement, since watts (W) quantify power, not the light itself. However, the power output of a light source can be measured in watts, indicating how much energy it emits as visible light over time. For example, a typical incandescent bulb might produce around 800 lumens of visible light with a power consumption of about 60 watts. The actual amount of visible light (in lumens) produced per watt varies by the type of light source used.
White light is what we see when light of all (or most) of the frequencies in the visible spectrum are emitted together from the same source. It is the combination of every visible light wave.
No, a bicycle reflector is not a source of light on its own. It works by reflecting light from other sources, such as car headlights, to make the bicycle more visible in low-light conditions.