A lumen is the perceived intensity of the light, as seen by the human eye. The lumen value is largely determined by the the nature of the light, i.e. the sum of the different wavelengths of the light being transmitted by the particular bulb type.
The standard tungsten wire-filament ('incandescent') bulb radiates a different type of light to a flourescentlight.
* a 230 V, 40 watt incandescent bulb produces a light (quality) of about 400-500 lumens,
* a standard 230 V flourescent lamp of only 7 watts will produce exactly the same value of lumens, i.e. 400-500 lumens. * the cool white XLamp XP-G 3.5 V LED lamp of only 3 watts will produce a similar value of lumens, i.e. 350 lumens. And is safer for the workers that make them and better for the environment. It is currently more expensive, but prices have been dropping about 20% per year. Therefore LED light bulbs convert electricity into light more efficiently than incandescent or florescent light bulbs. * For more information, See Related links below this box
I think the term you mean is "candle power" (candelas is a conversion of the power of a bulb in comparison to the power of a candle) The standard 40 watt bulb power would depend on the configuration of the bulb. (the filiment array, shape of the bulb, amount of refectors or "prizims" incorporated into the face of the bulb as in a flood light) The standard 40 watt bulb in your desk lamp average 25 to 29 candle power. A flood light would generate roughly 35-40 candle power, again, depending on the size of its face.
A 100 W incandescent bulb produces about 1750 lumens or 137 foot-candles
A 23 watt fluorescent light produces about 1600 lumens or 125 foot-candles
A lumen is the total amount of light visible light emitted by a source. A 100 Watt CFL will emit 1750 lumen.
The formula you are looking for is I = W/E. To answer the question the voltage applied to the light bulb must be known.
How many foot candles in a 150 watt bulb?
A 65 Watt incandescent light bulb should draw 65W/120V = 541.67mA
The amps drawn by a 65 watt light bulb should be 65/120 or 0.54167. This fraction of an ampere may be restated as 541.67 milli-amps.
draw 0.104 amps
To answer this question the voltage of the bulb is needed.
figure out how many amps are in a watt and x by 40
A 65 Watt incandescent light bulb should draw 65W/120V = 541.67mA
The amps drawn by a 65 watt light bulb should be 65/120 or 0.54167. This fraction of an ampere may be restated as 541.67 milli-amps.
draw 0.104 amps
To answer this question the voltage of the bulb is needed.
figure out how many amps are in a watt and x by 40
A 120 volt table lamp with a 75 watt bulb will pull 0.625 amps. With a 100 watt bulb it will pull 0.833 amps. And with a modern fluorescent 13 watt bulb it will pull 0.108 amps.
Watts = Volts X Amps. Amps=Watt / Volts. So, with a 240V mains, a 60W bulb draws 0.25amps. On a 12 system (car/auto) a 60W bulb draws 5 amps. On a 110V mains, a 60W bulb draws .55 Amps.
On this calculation I am assuming that the light bulb is using a 120 volt source. Watts = Amps x Volts. Amps = Watts/Volts, 40/120 = .33 amps. R = Volts/Amps, 120/.33 = 363.6 ohms resistance in the 40 watt light bulb.
A 60 watt bulb at 12 volts will pull 5 amps of current.
Amps x volts = watts So, assuming you are running on 110 volt line, the answer is 65 watts/110 volts=.591 amps.
It is drawing .06 amps.
Watts = Volts x Amps x Power Factor. An incandescent light bulb is a resistive load so PF = 1. ANSWER: = 1/2 Amp