A 20 watt incandesent bulb is dim. For a medium sized room you need 100 watts.
A 20 watt halogen bulb is brighter but still quite dim. These are marketed as low-energy but they are not. For a medium sized room you need 80 watts.
A 20 watt fluorescent bulb can light a medium sized room quite brightly. This is a genuine low energy bulb.
Lumens measures how bright it is, watts measures how much electric power it uses up. An old-type incandescent bulb produces about 10 lumens per watt. A halogen produce about 13 lumens per watt. A fluorescent (energy saving) bulb produces about 50 lumens per watt. LEDs produce somewhere around the same as a fluorescent.
Common indoors type light bulbs, from most efficient to least efficient: regular size tubular fluorescent lamps with electronic ballasts CFLs (compact florescent lamps) fluorescent lamps with reactive ballasts (old type of ballast) incandescent halogen lamps incandescent tungsten lamps
A compact fluorescent lamp or CFL has the advantage of consuming less power.It works in the same way as a fluorescent tube light however it is made in a much more compact shape. This means CFLs can be used to replace ordinary light bulbs which have incandescent filaments.If you replace your ordinary light bulbs with CFLs they will use only 20% (one fifth) of the energy to give you the same amount of light output.More informationEnergy-saving lamps, such as normal and compact fluorescents, save a lot of money compared to normal lamps which have an incandescent filament because of the fact that fluorescents don't use a high-temperature filament that produces more heat energy than light energy.Mainly because they run "cool", a fluorescent lamp uses only about one fifth - 1/5 - of the electrical energy used by a lamp that has a hot, incandescent filament.Put another way, you can use five fluorescent lamps, each giving out the same amount of light as one incandescent, for only the same total electricity running costs.Another good thing about fluorescent lamps is that they have a useful life that is between 5 and 10 times longer than an incandescent lamp, saving even more money over a period of years.
No, the most energy efficient bulbs are LED (Light Emitting Diode) light bulbs.
It is not a waste of money if you need the light but that being said, the higher the wattage usually reflects in a higher cost to the consumer. To answer this question the voltage and current of each device should be stated so that calculations could be made. An energy saving fluorescent is driven by an internal ballast and it is the ballast input current that is needed.
The energy saving light-bulbs are usually fluorescent. Neon is a type of fluorescent light bulb.
They are known as CFL bulbs. It stands for Compact Fluorescent Lamps.
Krypton is used as a filling gas for energy-saving fluorescent lights and as an inert filling gas in incandescent bulbs.
Krypton is used as a filling gas for energy-saving fluorescent lights and as an inert filling gas in incandescent bulbs.
Fluorescent lighting is much more energy efficient than incandescent lamps, usually by as much as 60 to 80%. That also translates into a corresponding energy savings. I don't recall the exact figure off hand, but the light output from a fluorescent lamp is about three times it's rating. For instance, a 40 watt fluorescent puts out the equivalent light of a 120 watt incandescent bulb.
A compact fluorescent lamp (CFL), also called compact fluorescent light, energy-saving light, and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent lamp; some types fit into light fixtures formerly used for incandescent lamps. The lamps use a tube which is curved or folded to fit into the space of an incandescent bulb, and a compact electronic ballast in the base of the lamp.
It varies, depending on the specific model, but an energy-saving (fluorescent) light bulb should save at least half the energy, for the same luminosity, compared to the old-fashioned incandescent light bulbs. The incandescent light bulbs ought to be outlawed, except for specific purposes where the heat they generate is actually needed.
Lumens measures how bright it is, watts measures how much electric power it uses up. An old-type incandescent bulb produces about 10 lumens per watt. A halogen produce about 13 lumens per watt. A fluorescent (energy saving) bulb produces about 50 lumens per watt. LEDs produce somewhere around the same as a fluorescent.
There are many ways to save energy, for example, light emitting diodes (LEDs) use much less energy than incandescent lighting or even fluorescent lighting. Whether you do or do not eat lunch seems to be irrelevant to the issue of saving energy.
Compact fluorescent light globes.
In the most general terms, you can do two things. (1) Turn off appliances you don't need. For example, turn off lights and television when nobody is using them. (2) Get energy-saving versions of some equipment. For example, if you still have incandescent light-bulbs, replace them with the more modern (and energy-saving) fluorescent ones.
Lumens measures how bright it is, watts measures how much electric power it uses up.An old-type incandescent bulb produces about 10 lumens per watt.A halogen produce about 13 lumens per watt.A fluorescent (energy saving) bulb produces about 50 lumens per watt.LEDs produce somewhere around the same as a fluorescent.Read more: Is_a_35_lumens_bulb_as_bright_as_a_60_watts_bulb