Try contacting a specialized electrical lighting contractor or lighting fixture store. They should have the formulas to determine this for you.
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.
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
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.
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.
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