What is par for lightbulbs


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The size of the bulb socket is indicated on the packaging as well as on the bulb socket.

This size is encoded with the capital letter "E."and a number that indicates the thread socket diameter in millimeters."E."stands for the inventor E.dison, who invented the first commercially viable light bulb in 1879. According to DIN 40400, "E" stands for electrical thread.

The actual invention of the incandescent lamp is attributed to the German-American Heinrich Goebel, who invented the incandescent lamp before Edison in 1854 using a charred bamboo fiber as a filament.
However, this widespread version of the invention was skilfully directed during the Nazi era, with the result that the actual inventors and researchers and their experiments were pushed into the background.
A well-researched development history and correction of the incandescent lamp invention can be found at



When buying an incandescent lamp or a compact fluorescent lamp, the information attached to the lamp (screw) socket about the size to be used (e.g. E 27), the electrical voltage in volts (e.g. 230 V) and the maximum permissible Observe power in watts (e.g. max. 60 W).

  E 5.5 Small lamps / Lilliput lamps (e.g. for instrument lighting).

  E 10 Low-voltage lamps (e.g. for flashlights, bicycle lamps).

  E 14 Mignon base. Candle lamps, decorative lamps (up to approx. 40 watts), compact fluorescent lamps.

  E 27 Edison base. Normal lamps, reflector lamps (from approx. 40 watts), compact fluorescent lamps.

  E 40 Goliath socket. Floodlight lamps from 250 watts.



Luminosity comparison table between
Incandescent lamps and compact fluorescent lamps (ESL = energy saving lamps
LightbulbCompact fluorescent lamp with electronic ballast (EVG = electronic ballast)
25 wattscorresponds to 5 watts
40 wattscorresponds to 7 watts
50 wattscorresponds to 9 watts
60 wattscorresponds to 11 watts
75 wattscorresponds to 15 watts
100 wattscorresponds to 20 watts
120 wattscorresponds to 23 watts
Compact fluorescent lamps thus save up to 80% electricity, depending on their design, and have a burning time that is 3 to 15 times longer than conventional incandescent lamps (according to the manufacturer) with significantly reduced heat radiation. The disadvantage, however, is the decrease in luminosity with aging. This can be as low as 80% of the brightness when new after 1,000 operating hours.


     The aim is to increase the use of energy-saving fluorescent lamps EU eco-label
(stylized daisies: 12 blue stars, the Europe E in the middle).

Award criteria are: efficiency,
Mercury content (limit value 3 - 8 mg),
Packaging, product information and burning time.

Because of the poisonous mercury it contains, the electromagnetic radiation and the burning time, which is too cheap compared to conventional incandescent lamps, consumer protection groups have massive concerns about the use of these lighting means.
Further points of criticism are the widespread refusal to take back products and the health risks if the lamp breaks as a result of the release of mercury vapors.

Note! In the period between September 1, 2009 and September 1, 2018, conventional incandescent lamps and halogen lamps were gradually banned in the EU. After that, only particularly efficient lamps are permitted.


  Compact fluorescent lampsthat start with the capital letter "Tbsp" (= elelectric detonator) or "electronic" have an integrated electronic ballast (EVG). The advantages are a longer service life, no flicker and a high degree of efficiency.

  Halogen light bulbs with IRC technology (I.nfra-R.ed-C.oating = infrared coating) have significant advantages over standard halogen bulbs in terms of service life, heat generation, light yield and lower power consumption due to the special glass bulb inner coating.


Furthermore, the amount of light emitted by a light source is shown on the packaging in the unit of measurement "Lumens"(lat .: light) with the abbreviation lm (Φ) specified.
With the lumen specification, illuminants can be compared with one another.


Light sourceΦ luminous flux
Wax candle10 lm ☀
Light emitting diode (LED) 1 W50 lm ☀
Light-emitting diode (LED) 3 W150 lm ☀
Light-emitting diode (LED) 4 W300 lm ☀
Light-emitting diode (LED) 5 W400 lm ☀
Light-emitting diode (LED) 8 W600 lm ☀
Light-emitting diode (LED) 9 W750 lm ☀
Light-emitting diode (LED) 10 W1,000 lm ☀
Light-emitting diode (LED) 15 W1,500 lm ☀
Incandescent lamp 15 W120 lm ☀
25 W incandescent lamp230 lm ☀
40 W incandescent lamp430 lm ☀
60 W incandescent lamp720 lm ☀
Incandescent lamp 75 W930 lm ☀
100 W incandescent lamp1,350 lm ☀
Energy saving lamp 9 W400 lm ☀
Energy saving lamp 11 W600 lm ☀
Energy saving lamp 15 W900 lm ☀
Energy saving lamp 20 W1,200 lm ☀
Energy saving lamp 23 W1,500 lm ☀
12 volt halogen lamp 12 W.140 lm ☀
12 volt halogen lamp 20 W350 lm ☀
12 volt halogen lamp 50 W950 lm ☀
12 volt halogen lamp 100 W2,500 lm ☀
20 W fluorescent lamp1,200 lm ☀
40 W fluorescent lamp5,000 lm ☀
100 W fluorescent lamp3,000 lm ☀
High pressure mercury lamp 250 W13,000 lm ☀
High pressure mercury lamp 1,000 W58,000 lm ☀
High pressure sodium lamp 1,000 W130,000 lm ☀


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