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EXAMPLE: A certain 100-watt bulb emits a total luminous flux of 1200 lm, distributed uniformly over a hemisphere. Find the illuminance and the luminous intensity at a distance of 1 m, and at 5 m.
SOLUTION: The area of a half-sphere of radius 1 m is
(2[pi])(1 m)² = 6.28 m²
The illuminance at 1 m is
E = 1200 lm ÷ 6.28 m² = 191 lm/m² = 191 lux
What else can I help you with?
What do you notice about the brightness of the bulbs in the parallel curcuits as you add more bulbs to it?
Nothing if the current capacity of the circuit is not exceeded. The extra bulb will draw more current and if the limit is not reached all bulbs will continue at their rated brightness. If the current capacity is overrdrawn either the circuit breakeer will break and stop all lights or if the capacity is not fused all lights will dim.
How many kilograms in 25 kilo newton?
Since 1 kilonewton (kN) is equal to 1000 kilograms, 25 kilonewtons would be equal to 25,000 kilograms.
How many pound 12 ton?
1 ton is equal to 2,000 pounds. So, 12 tons would be equal to 24,000 pounds.
How many AA batteries make a pound?
It would take about 30 AA batteries to make a pound. Each AA battery typically weighs around 0.8 ounces, so you would need 16 batteries to equal one pound.
What are some advantages of using a Photon light?
Photon light can be an advantage because it is very bright. Many small flashlights are LED based with a photon light making it a lot easier to see in the dark. A LED based flashlight would come in handy for people who are stranded somewhere late at night. The light would shine further and brighter.
Are LED lights dimmable?
Yes, many LED lights are dimmable. Havells Lighting offers dimmable LED lights designed for smooth brightness control with compatible dimmer switches.
Can you grow cannabis plants using Christmas lights?
how many led christmas lights to equal 4100lm
Would you need half a million full moons to equal the brightness of the sun?
The apparent magnitude (AM) [See Link] is a measure of its brightness as seen by an observer on Earth, in the absence of the atmosphere. The brighter the object appears, the lower the value of its magnitude. The Sun has an AM of -26.73 whereas a full Moon has an AM of -12.6. The scale is logarithmic: the relative brightness of two objects is determined by the difference of their magnitudes. Pogson's Ratio was suggested in 1856 so that each decrease in magnitude represented a decrease in brightness equal to the fifth-root of 100 (or about 2.512) So, the difference in magnitude is (-12.6) - (-26.73) giving 14.13 Thus 2.51214.13 = 449,032. Close enough to half a million.
How many pages does Brightness Reef have?
Brightness Reef has 518 pages.
What are the functions of a strip light?
There are many functions for strip lights. One example is used for decorative purposes. These lights are normally low level bright lights. Another example is background lighting with high level brightness. As an example you may see these light in storefront windows for background lighting.
What object is brighter than the sun?
Brightness is related to luminousity and distance. On Earth, the brightest thing would be a nuclear explosion. In space, the brightest thing would be a supernova, but it all depends on the distance from it.
How many syllables are in the word brightness?
The word bright has one syllable. It is pronounced BRYT.
What types of buildings would be most likely to install high bay lights?
Many types of buildings would be likely to install high bay lights. Department stores with many floors will likely install high bay lights as well as apartment buildings.
How many 4" can lights should be installed in the living room for optimal lighting?
The number of 4-inch can lights needed for optimal lighting in the living room depends on the size of the room and the desired level of brightness. It is recommended to consult with a lighting professional to determine the appropriate quantity for your specific space.
What are some of the advantages of solar post lights?
There are many different advantages surrounding the use of solar post lights. The most noted benefit would be that one would have a lower electricity bill as the lights are 'fed' by the sun.
What Christmas word has the letters glhist?
These letters form the word 'lights'. It would be in reference to the many coloured lights and Christmas lights displays one sees during this season.
How many pints would 24 ounces equal?
16 ounces would equal 1 pint, so 24 ounces would equal 1.5 pints.
