Q: How do you determine the correct wattage or lumens needed to properly light a given size room?

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The power of light bulbs are measured in wattage (watts) and/or lumens.

CFL's have 60-70 lumens per watt. So for a 65watt bulb, you'd take between 60-70 lumens and multiply that by the wattage. So 60lumensx65Watts=3900 & 70x65=4550 meaning a 65watt CFL will put out anywhere between 3900-4550 lumens.

It varies from about 600 to 1100 lumens. Typically the higher the lumens output, the shorter the lifespan of the globe. Have a look at this list of globes for purchase whih shows wattage and lumens: http://1000bulbs.com/category/75-watt-incandescent-standard-shape-light-bulbs/

No. All light from light bulbs (incandescent) are equally bright. Higher wattage bulbs simply produce a higher quantity of light measured in lumens.

If you have the wattage of the laser you can plug it into a formula X/P=L. Where One lumen is equal to 0.001496 watts (1.496mW) which is Power. X is the number of watts or milliwatt and L is Lumens. So if you have a 1 watt laser you have 668.449 lumens being produced by it.

161 lumens I believe the above answer to be inaccurate. It depends on the light source. For example: For an incandescent light bulb 1 watt it is approx. 18 Lumens. However most LED's use only about 10% the wattage to produce the same amount of light. So for LED's .1 watt produces 18 Lumens.

The amount of light (Lumens) delivered by a light bulb cannot be determined by it's wattage. Bulbs of any wattage by different manufacturers can have different output (lumens). Everything else being the same, a 34 watt 110volt bulb will put out about half the light than a 34 watt 220 volt bulb, and a 12 volt one will put out about 10% of the light as the 120 volt one will.

Bulb brightness is measured in lumens which express the amount of light produced, while the electric power used is measured in watts. The typical efficiency of some different types of bulb is: Incandescent 12 lumens per watt Halogen 17 lumens per watt CFL (compact fluorescent) 50-60 lumens/watt LED (light-emitting diodes) 90-100 lumens/watt.

It's a unit called lumens. You can look that up and find more about it. Or if you're I. The movie industry, it's measured in wattage. Hope this helps.

The actual amount of light (lumens) given off by a bulb depends on the how the bulb was made and with what materials. It depends on the filament material, its length and thickness, and the type of gas in the bulb. As a rule, longer lasting bulbs of the same wattage will generally be less bright than others and brighter bulbs of the same wattage will not last as long as other bulbs.Sample lumen outputs:Sylvania 250 Watt Indoor Soft White 3-Way Bulb can emit 3940 lumens at its highest setting.Philips 250 Watt 120 to 130V PAR38 Krypton Flood Bulb emits 3100 lumens

Fluorescent lamps can output a total of 100 lumens per watt. Fluorescent lamps were invented by Peter Cooper Hewitt in 1901.

120 lumens.

You would need to know the rated lumens for each wattage bulb and compare that way.

It depends on how you define efficiency. Efficiency is a measure of how one item performs in comparison to another. One single item does not have any efficiency by itself. If by efficient you mean what it costs to operate, the higher the wattage the less efficient it is. But with higher wattage you also get more light. If by efficient you intend to compare incandescent bulbs of the same wattage with one another, you want to compare lumens, which is the measure of actual light output. Comparing 2 bulbs of the same wattage, the bulb with the higher lumens would be considered more efficient than the other. Compact fluorescent bulbs (CFL) are considered more efficient than incandescent bulbs because they put out much more lumens for the same wattage. A 13W incandescent puts out almost no light at all. A 13W CFL puts out what is about equivalent in lumens to a 60W incandescent. Since watts are the measure of power used, a 13W bulb is more efficient than a 60W bulb with similar lumens. In electrical physics, heat is a measure of inefficiency. The most efficient electrical equipment would do its work while producing almost no heat at all. This means that as a matter of physics, an incandescent bulb is terribly inefficient because it puts out a lot of heat.

It depends on the lamp wattage. For most domestic lamps (40 to 100W) around 12 to 17 lumens/Watt; typical examples below. 25W = 220 lm, 40W = 480 lm, 60W = 850 lm, 100W = 1700 lm

Could be 500 lumens for a incandescent lamp, or 2500 lumens for a fluorescent.

You are likely looking for a CFL that is equivalent to a 40 watt incandescent bulb. You want the lumens to be equivalent. The wattage required for the CFL will be quite a bit less than for the incandescent.

I assume you mean the amount of light, not its color or frequency. The SI unit of luminous intensity is the Candela, and this emits light measured in Lumens, which is the quantity you will find quoted for light bulbs, as well as wattage. If the light source of 1 Candela emits light in all directions, it emits 4 x Pi lumens, so the number of lumens is related to the solid angle over which the light is emitted. There is also the Lux which is the number of lumens per square meter. This obviously falls off the further away you are from the source.

Currently maximum LED luminous efficiency is about 114 lumens/W, measured at 50mA. Average luminous efficiency is about 104 lumens/W. Ordinary LED light effect is about 60 lumens / W. 18W is about 130 lumens is about 1080 lumens.

incandscent light bulbs voltage is 120 wattage is100 light output is 1560 lumens,use resistance as a function of temperature

I would compare lamps of the same wattage to see which one puts out more lumens, which is the measurement of actual light output.

950 lumens is slightly less bright than the output of a 100 watt incandescent bulb. (100 watts = 1160 lumens, 60 watts = 630 lumens)

Area can be used to find lumens. There are specific equations that are used to find lumens and area can be included in these equations. Plug the numbers into the equations and the amount of lumens will be found.

Approximately 15 lumens per watt for halogen, so 300 lumens.

It depends......perhaps 7400 to 8500 initial lumens degrading to 5400 lumens.