We’ll find the answers to all questions
To dispel all doubts about convenience and reliability of energy-saving lamps (compact fluorescent lamps) use, we have collected in this article answers to the questions that are most frequently asked by consumers. If you did not find an answer to the question that troubles you, please write us and we will try to answer you.
Is it true that simultaneous use of incandescent and fluorescent lamps is harmful for health?
We'd rather say, vice versa. Divergence of radiation frequencies will just increase the light frequency spectrum. However, radiant intensity of fluorescent lamps is much higher, therefore, as a rule, it's inexpedient to turn on also incandescent lamps at the same time.
It is said that energy-saving lamps give unbeautiful white light. The light given by incandescent lamps is cozier...
Energy-saving lamp may have various color temperatures, as a rule, there are three temperature meanings. Color temperature is determined in Kelvin units (K). The higher is the number of K's, the "colder", or whiter, is the light given by the lamp.
"Kosmos" brand lamps are represented in three color temperatures:
- warm light 2700 K (yellow light like from an incandescent lamp);
- day light 4200 K (soft white light);
- cold light 6400 К (saturated white light).
On a pack of an energy-saving lamp it is written that they cannot be used together with dimmers. Please explain what is dimmer and what is it used for?
A dimmer, or a light adjuster, is used for smooth variation of light brightness of lighting fixtures using incandescent lamps as a light source. This helps to adjust more efficiently the luminosity level in the room which will correspond to your wish, your mood and to the situation.
Since at a less brightness a lamp consumes less electric energy, a dimmer allows to save a certain part of electric energy in comparison with an ordinary switch. It really can not be used with energy-saving lamps, this is connected with their technical particular features. But our company has already represented Megaman compact fluorescent lamps at the market. In these lamps for the first time the technology is applied that allows to adjust brightness of an energy-saving lamp with the help of an ordinary two-position switch. Having turned a light off and on within 1 second, you activate a program of lamp light brightness adjustment. With each turning off/on you shift between 100%, 66%, 33% and 5% of lamp brightness.
What is color rendering index?
Color rendering index is a ratio of colors of objects illuminated with a reference light source to colors of the same objects illuminated with the tested light source. It is designated with Ra symbol. For example, Ra from 91 to 100 is considered a very good color rendition, from 81 to 91 - good, 51-80 - middling, less than 51 - a weak color rendition.
Is it true that fluorescent lamps radiate much ultra-violet?
No, it isn't. Ultra-violet radiation from standard fluorescent lamps is very little and does not represent a danger. According to the results of investigations carried out in the USA, a person spending a 8-hour working day in the light of fluorescent lamps receives as much ultra-violet radiation as when being under the sun in a fine July day in a district of Washington just more than for one minute.
What is average service life of lamps of various types?
Incandescent lamps of general use have a service life of 1000 hours. Halogen lamps operate depending on working conditions from 2000 to 4000 hours. Fluorescent tubular and energy-saving lamps operate from 4000 to 15000 hours.
On a pack of a "Kosmos" energy-saving lamp it is written: service life 8000 hours and eight years. What's the difference?
8000 hours is an absolute service life of a lamp. 8 years is a relative service life at the lamp operation for 2,7 hours per day (2,7 hours is an average lamp operation time per one day).
What is it necessary to do if a (compact) fluorescent lamp is broken?
Since quantity of mercury in fluorescent lamps is very small, so, all the lamp leavings can be thrown out as common garbage (if we speak about only one lamp).
What is energy efficiency class?
In accordance with a directive of the European Union, all common lamps fed directly from electric power network must have a marking showing the energy efficiency class (lm/Wt). An exception is made for lamps with a luminous flux of more than 6500 lm, reflector lamps and lamps with a power less than 4 Wt. An energy efficiency class is designated with letters from A to G. A class corresponds to the highest efficiency.
An approximate correspondence of various lamps types to energy efficiency classes:
A: fluorescent lamps with three-layer luminophor, linear and pin compact fluorescent lamps, compact fluorescent lamps with electronic ballast.
B: fluorescent lamps with halophosphate luminophor, some pin compact fluorescent lamps, compact fluorescent lamps with electromagnetic ballast,
C: high-performance halogen lamps,
D: other halogen lamps,
E/F: standard incandescent lamps,
G: decorative incandescent lamps and other.
Why a compact fluorescent lamp emitted a very loud clap when I dropped it?
Pressure in a fluorescent lamp is much lower then atmospheric. The clap means that hermiticity of the lamp has been broken and air rushed inside. This lamp will not operate anymore.
Is it true that compact fluorescent lamps are less safe than incandescent lamps?
Provided that fluorescent lamps are correctly used, they may be considered as safe as incandescent lamps. The biggest danger for lamps of the both types is connected with possibility of breaking. Fluorescent lamps contain some vapors of mercury in small quantity. However, content of mercury in modern energy-saving lamps is very low - from 2 to 5 mg, in standard fluorescent lamps - 20-100 mg. For comparison: mercury content in a medical thermometer is 2-3 g. Luminophors used in all modern fluorescent lamps are not toxic.
Why quite often flickering is felt when fluorescent lamp operates?
Such a light flickering (pulsing) is typical for lamps operating with electromagnetic ballast. More modern ballasts - electronic ballasts operate at high frequencies (20-30 kHz), in this case flickering is absent. Electronic ballast is used in compact fluorescent lamps (energy-saving lamps).
Why my energy-saving lamp sometimes blinks being in turned-off condition?
Blinking of energy-saving lamps takes place in a case when electricians have mistakenly mounted an electric wiring in the flat so that the switcher cuts off the "zero" but not the "phase", And after switching off the lamp keeps on staying under voltage.