Power Lumens
Power Lumens
What is the difference between lumens, candle power, and lux?
Why are each of them used on different light sources?
*A LUMEN is a unit of measurement of light. It measures light much the same way.
Remember, a foot-candle is how bright the light is one foot away from the source.
A lumen is a way of measuring how much light gets to what you want to light!
A LUMEN is equal to one foot-candle falling on one square foot of area.
Candlepower is a way of measuring how much light is produced by a Light Bulb, LED or by striking an arc in a Carbon-Arc spotlight. Is it a measure of how much light falls upon an object some distance away? No. That’s illuminance. Is it a measure of how well we see an object that is illuminated by that light source? No. That’s something all together different, and we are not going there!
Nowadays we use the term CANDELA instead of candlepower. Candlepower, or CANDELA is a measure of how much light the bulb produces, measured at the bulb, rather than how much falls upon the thing you want to light up. Further confusing the matter is beam focus. That’s how much candlepower can be focused using a reflector/lens assembly. Obviously, if you project all your light bulbs intensity at a given spot, or towards something, it will be more intense, and the illuminance will be higher.
And here comes the confuser! A candlepower as a unit of measure is not the same as a foot-candle. A candlepower is a measurement of the light at the source, not at the object you light up.
And a candela is the metric equivalent of the light output of that one candle, based on metric calculations. And since using a candle is rather imprecise, the definition was amended to replace a light source using carbon filaments with a very specific light source, see the following:
The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.
*Candlepower is a measure of light taken at the source-not at the target. Foot-candles tell us how much of that light is directed at an object we want to illuminate.
*LUX is an abbreviation for Lumens per square meter.
Foot-candles equal the amount of Lumens per square feet of area.
So, that one candlepower equivalent equals 12.57 lumens.
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FREE SH 10x 3W LED WARM White Lamp Bright Light High Power Chip 160 Lumen D1 $9.50 |
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5 pcs x 3W Watt LED WARM White Lamp Bright Light High Power Chip 160 Lumen D1 $4.99 |
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FREE SH BULK 100 x 3W LED COOL White Lamp Light High Power Chip 160 Lumen D1 $85.00 |
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5 pcs x 3W Watt LED COOL White Lamp Bright Light High Power Chip 160 Lumen D1 $5.99 |
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Hgh power 20W White Led 1000 Lumen Energy Saving Lamp ! $0.90 |
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10pcs 3W Power blue Led 80~100 Lumen $15.99 |
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5pcs 3W Ultra Brightest Power White Led 160~180 Lumen $12.99 |
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50pcs 3W Power blue Led 80~100 Lumen $69.99 |
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2pcs 3W Ultra Brightest Power red Led 100~120 Lumen $4.99 |
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5pcs 3W Power blue Led 80~100 Lumen $8.99 |
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2pcs 3W Ultra Brightest Power White Led 160~180 Lumen $5.99 |
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100pcs 3W Power blue Led 80~100 Lumen $121.99 |
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BULK 20 x 1W LED COOL White Lamp Light High Power Chip Energy Saving 90 Lumen D2 $6.99 |
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FREE SH 10x 3W LED COOL White Lamp Bright Light High Power Chip 160 Lumen D2 $11.99 |
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1W 80-Lumen Pure White LED; 5500K 350mA 80lm; High-Power Lamp, Ships From USA! $4.45 |
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10pc 1W 80-Lumen Pure White LED; 5500K 350mA 80lm; High-Power Lamp Light USA $10.75 |
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3W Cool White 10000K 150 Lumen High Power Star LED Light for Aquarium/Tank $9.49 |
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3,Prolight Power 1W Full Color 70 Lumen LM Green Led,G1 $19.99 |
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10pcs 3W Power red Led 60~80 Lumen $15.99 |
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50pcs 3W Power red Led 60~80 Lumen $69.99 |
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10W 10 WATT WARM WHITE HIGH POWER LED LIGHT 600 LM LUMEN $4.99 |
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20W 20 Watt Cool Cold White 20000K High Power LED Bulb Lamp Light 2000 Lumens $12.99 |
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1x Red, 1x Green, 1x Blue 10W High Power LED 600LM Lumen Energy Saving Light $32.99 |
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High Power 10W white LED 900 Lumen Lamp + 60 degree lens $5.50 |
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High Power 10W Warm White LED 800 Lumen Lamp Light + 60 degree lens $5.50 |
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High Power 10W Blue LED 400 Lumen Lamp Light + 60 degree lens $5.50 |
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High Power 10W Red LED 600 Lumen Lamp Light + 60 degree lens $7.35 |
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High Power 10W Green LED 800 Lumen Lamp Light + 60 degree lens $7.99 |
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Lots 10 pcs High Power 10W Green LED 800 Lumen Lamp Light + 60 degree lens $75.99 |
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Wholesale 10 pcs High Power 10W Red LED 600 Lumen Lamp Light + 60 degree lens $67.99 |
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Lots 10 pcs High Power 10W Blue LED 400 Lumen Lamp Light + 60 degree lens $43.99 |
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Lots 10 pcs High Power 10W Warm White LED 800 Lumen Lamp Light + 60 degree lens $43.99 |
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Lots 10 pcs High Power 10W white LED 900 Lumen Lamp + 60 degree lens $43.99 |
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5x Red 3W LED Lamp Prolight Star 80Lm High Power Lumens $14.99 |
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BULK 20 x 1W LED WARM White Lamp Light High Power Chip Energy Saving 90 Lumen D3 $6.99 |
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5 pcs x 3W Watt LED WARM White Lamp Bright Light High Power Chip 160 Lumen D3 $5.99 |
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FREE SH BULK 300 x 3W LED COOL White Lamp Light High Power Chip 160 Lumen D3 $199.00 |
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3W White LED High Power Cool White Component Chip DIY 3 Watt 240 Lumens From USA $4.49 |
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5pcs 3W Ultra Brightest Power red Led 100~120 Lumen $11.99 |
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5W Blue LED High Power 460-470 nm Component Chip DIY 5 Watt High Lumens From USA $6.99 |
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FREE SH BULK 100 x 3W LED WARM White Lamp Light High Power Chip 160 Lumen D4 $85.00 |
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5 pcs x 3W Watt LED WARM White Lamp Bright Light High Power Chip 160 Lumen D4 $5.99 |
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FREE SH 10x 3W LED COOL White Lamp Bright Light High Power Chip 160 Lumen D4 $9.99 |
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200 PCs 1W HIGH POWER WARM WHITE LED 90 Lumen 1 Watt WO $215.99 |
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5 PCs 3W PROLIGHT STAR HIGH POWER WHITE LED 140 Lumens $19.99 |
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100W Yellow 6000LM Lumen Energy Saving Star High Power LED Lamp Light $84.99 |
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Red 100W High Power LED 6000LM Lumen Energy Saving Lamp Light $84.99 |
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80W White High Power Led Light 80 Watt 5600LM Lumen New $59.99 |
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BULK 50 x 1W LED COOL White Lamp Light High Power Chip Energy Saving 90 Lumen D5 $17.50 |
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FREE SH BULK 300 x 3W LED WARM White Lamp Light High Power Chips 160 Lumen D5 $175.00 |
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100 Watt Energy Saving CFL Mogul Base Bulb (R1447) $22.99 Replaces incandescent bulbs up to 1000 watts, but uses only 100 watts of power and lasts up to thirteen times longer than standard 1000 watt bulbs. Compact Fluorescent Light (CFL) type bulb. One bulb per package. Bright white sunlight. 100 watts. E39 mogul base. Light output of 10500 lumens. 6500K color temperature. One bulb per package. Ballast not included. |
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12 Watt Dimmable LED Directional Light Bulb (W4099) $39.99 This energy efficient directional medium base light bulb is lit by LEDs and uses only 12 watts of energy. It has a bulb life of 25,000 hours and is comparable to a 60 watt incandescent bulb. The color temperature is approximately 2700K with a light output of 800 lumens. One bulb per package. Price is for one bulb. Light out put Lumens 800. Energy used 12 watts. Life span 25,000 hours. No UV or IR light radiation. Indoor use. Light weight housing with excellent heat dissipation for high power operation. Optimized heat fins with an artistic design. Current controlled LED integrated driver inside. Long life,Mercury and lead free construction. Illumination uniformity . Warm white 2700K. Dimmable. Equivilant to a 60 watt incandescent bulb. |
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18 Watt Energy Saving CFL 4 Prong Mini Base Bulb (R1448) $9.99 Replaces incandescent bulbs up to 75 watts, but uses only 18 watts of power and lasts up to thirteen times longer than standard 75 watt bulbs. Compact Fluorescent Light (CFL) type bulb. One bulb per package. Warm white light. 18 watts. 4 prong mini pin base. Light output of 1600 lumens. 2700K color temperature. One bulb per package. Ballast not included. |
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30 Watt Circular Warm White Light CFL Light Bulb (R1443) $9.99 This compact fluorescent light (CFL) design uses only 30 watts of power. For use with 30 watt fluorescent fixtures. Please note: not for use with timers, photocells, dimmers, and motion control devices. Warm white light. 30 watts. 4 prong mini connector. Light output of 2200 lumens. 9" Diameter. Ballast not included. Not for use with dimmers, timers, photocells or motion control devices. |
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32 Watt Energy Saving CFL Bulb (31054) $12.99 Replaces bulbs up to 150 watts, but uses only 32 watts of power and lasts up to thirteen times longer than standard 150 watt 750 hour rated bulbs! Please note: do not use with dimming devices. Compact Fluorescent Light (CFL) type bulb. Bright white light. Light output of 2,000 lumens, 32 watts, average life of 10,000 hours. Price is for one bulb. Bright White CFL bulb. Replaces up to 150 watt bulbs. 32 watts. Light output 2000 lumens. Average lifespan 10,000 hours. One bulb per pack. Price is for one bulb. Not for use with dimmers. |
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4 E Series Recessed LED Downlight (U4050) $89.99 The retrofit downlight is for both new and retrofit construction. It installs easily in most standard four inch recessed housings, including IC and non-IC units. The E4 retrofit generates white light with built-in LED bulbs that offers a natural white light with high energy savings.The retrofit are dimmable with an estimated life around 35,000 hours.They consume only 10 watts of power but produce the equivalent of a 65 watt incandescent or 18 watt compact fluorescent. White finish. Adapter clips right in. 4" LED 3000K in color. Light output is 450 lumens Dimmable with most standard incandescent dimmer. Estimated life of 35,000 hours. Manufacturer warranty of 3 years. Title 24 Compliant Suitable for damp locations. 120 volt. Measures 2 1/2" height ,5" diameter. 92 degree angle . Clear "fresnel" style len. |
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42 Watt Energy Saving CFL Mogul Base Bulb (R1444) $14.99 Replaces bulbs up to 250 watts, but uses only 42 watts of power and lasts up to thirteen times longer than standard 250 watt bulbs. Compact Fluorescent Light (CFL) type bulb. One bulb per package. Bright white light. 42 watts. E26 Standard base. Light output of 2700 lumens. 6500K color temperature. One bulb per package. Ballast not included. |
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45 LED Motion-Activated Solar Security Light (T2773) $144.99 Harnessing the power of the sun, this 45 LED solar security light is a convenient and economical way to add motion-activated security lighting to any part of your home or yard with no need for wires or wall outlet connections. The large, flat-panel LED array swivels in virtually any direction and illuminates objects as far as 20 feet away. Resistant to water and weather and featuring an auto on/off dusk/dawn sensor, adjustable illumination duration and motion-detection range, and extra bright LEDs rated to last 100,000 hours. Includes easy wall or deck mounting brackets. Solar powered. 45 extra bright LED lamps. 270 lumens. Weather and water-resistant. Motion activated. Dusk/dawn auto on/off switch. Includes wall and deck-mounting hardware. 16 foot cord from solar panel. |
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6 LED Super Bright Outdoor Solar Flood Light (T4497) $79.91 This incredibly bright LED solar flood light is powered by the sun and uses a fraction of the electricity of a normal light. Light up flags, signs, house numbers, driveways, porches, statuary, or any large outdoor feature. It lasts virtually forever with no utility charges, ever. Light stays bright for up to 4 hours at full-power and up to 8 hours at half-power, when fully charged. Waterproof metal construction; works in all climates. Included solar panel collects energy during the day and at dusk, the LED lights turn on automatically. 6 LEDs. ,36 Lumens (equivalent to a 60 watt incandescent bulb ) Includes three rechargeable Ni-MH 1200mAh batteries. 6" wide solar panel. 15 foot cable included. Mounting hardware. User guide. Dimension of sealed lens is 4"X7" . |
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6 3000K LED DOWNLIGHT/WHT (U5195) $89.99 The retrofit downlight is for both new and retrofit construction. It installs easily in most standard six inch recessed housings, including IC and non-IC units. The E6 retrofit generates white light with built-in LED bulbs that offers a natural white light with high energy savings.The retrofit are dimmable with an estimated life around 35,000 hours.They consume only 15 watts of power but produce the equivalent of a 65 watt incandescent or 18 watt compact fluorescent. White finish. Adapter clips right in. 6" LED 3000K in color Light output is 675 lumens Dimmable with most standard incandescent dimmer. Estimated life of 35,000 hours. Manufacturer warranty of 3 years. Title 24 Compliant Suitable for damp locations. 120 volt. Measures 4 3/4" height ,7 1/16" diameter. 92 degree angle . Frosted polycarbonate len. |