General information about DRL lamps

Mercury lamps of high pressure (AML (arc mercury luminiferous type are used to lighting of streets, workshops of the industrial enterprises and other objects which are not demanding the quality color rendition).

Схема устройства лампы ДРЛ

Figure 1. Scheme of the device of the lamp of DRL.

Device: The lamp of DRL (fig. 1) consists of the glass cylinder 1 supplied with the threaded socle 2. In the center of the cylinder the mercury-quartz torch (tube) 3 filled with argon with mercury drop additive is strengthened. Four electrode lamps have the main cathodes 4 and additional electrodes 5 close to the main cathodes and connected to the cathode of opposite polarity via the additional coal resistor 6.

Additional electrodes, facilitate ignition of the lamp and do its work to stabler.

And now is more detailed:

Схема включения дросселя

Scheme 2. Inclusion of the throttle.

  1. The socle represents the simple design which allows to accept the electric power from the network circuit due to engagement of current carrying parts of the lamp of DRL (one of which threaded, and the second — dot) with electrical links of the boss of the lamp. Therefore electric power transmission on torch electrodes is carried out.
  2. The torch (quartz) is, perhaps, the main functional part of DRL of the lamp. The torch represents the quartz flask which on the parties has about two electrodes. Two of them the main and two - additional. The internal space of the quartz torch is filled with gas "argon" and mercury (the small droplet of mercury).
  3. The flask (glass) — is the external part of DRL of the lamp. The quartz torch of the lamp which the electric conductors going from the contact socle approach is placed in it. From the glass flask all air then nitrogen is pumped is pumped out. In the glass flask two limiting resistance (standing in the chain of additional electrodes) are located. DRL lamp flask from the inside has the phosphor.

One of the first lamps of DRL had only two electrodes in the design. It worsened conditions for commission of the arson of the lamp and demanded the additional device of start-up (pulsed high-voltage breakdown of the interval of the torch). Such kind of lamps of DRL was laid off also the zamenyona on the 4th electrode option. Needs only the throttle.

Principle of action

The torch (RT) of the lamp is made of high-melting and chemically resistant transparent material (the quartz glass or special ceramics), and filled with strictly dosed portions of inert gases. Besides, metal mercury which in the cold lamp has the appearance of the compact ball is entered into the torch, or accumulates in the form of the raid on walls of the flask and (or) electrodes. The column of electric electric discharge is shining bodied RLVD.

Схема ввода трансформатора

Scheme 3. Input of the transformer.

Process of ignition of the lamp equipped with the lighting electrodes looks as follows. When giving on the lamp of power voltage between close located the basic and the lighting electrode there is the glow discharge that is promoted by small distance between them which significantly less than a distance between the main electrodes, therefore, is lower also breakdown voltage of this interval. Emergence in the cavity of RT of rather large number of charge carriers (free electrons and positively ionized atoms) promotes breakdown of the interval between the main electrodes and ignition between them the glow discharge which almost instantly passes into arc.

Stabilization of electric and light parameters of the lamp occurs in 10 — 15 minutes after inclusion. During this time lamp current significantly exceeds rated and is limited only to resistance of the puskoreguliruyushchy device. Duration of the starting mode strongly depends on ambient temperature: the more cold, the lamp will longer inflame.

Electric discharge in the torch of the mercury arc lamp creates the visible radiation of blue or violet color and also powerful ultra-violet radiation. The last excites the luminescence of the phosphor put on the internal wall of the external flask of the lamp. The reddish luminescence of the phosphor, mixing up with the white-greenish radiation of the torch, gives the bright light close to white.

Схема включения лампы ДРЛ

Scheme of inclusion of the lamp of DRL.

Voltage variation of the power line in the big or smaller party causes corresponding change of the luminous flux. The deviation of power voltage for 10 — 15% is admissible and is followed by change of the luminous flux of the lamp for 25 — 30%. At reduction of supply voltage less than 80% rated, the lamp can not be lit, and burning — to go out.

When burning the lamp strongly heats up. It demands use in light devices with arc mercury lamps of heat-resistant wires, imposes serious requirements to quality of contacts of cartridges. As pressure significantly increases in the torch of the hot lamp, also tension of its breakdown increases. The size of tension of the power line is insufficient for ignition of the hot lamp. Therefore before repeated ignition the lamp has to cool down. This effect is the essential lack of arc mercury lamps of high pressure as even very short-term break of power supply extinguishes them, and repeated ignition requires the long pause on cooling.

General information: Lamps of DRL have high luminous efficiency. They are steady against atmospheric actions, their ignition does not depend on ambient temperature.

Important lack of lamps of DRL is intensive formation of ozone in the course of their burning. If for bactericidal installations this phenomenon usually is useful, then in other cases concentration of ozone near the light device can significantly exceed admissible on sanitary standards. Therefore rooms in which DRL lamps are used have to have the corresponding ventilation providing removal of excess of ozone.

O0dr-osnovnaya throttle winding, D0dr-dopolnitelnaya throttle winding, C3-noise suppressing condenser, SV-selenovy rectifier, R-shooter resistor, L-two-electrode lamp of DRL, R-discharger.

Inclusion: Inclusion of lamps in network is carried out by means of PRE (the pusko-regulating equipment). In usual conditions consistently with the lamp the throttle (scheme 2) joins, at very low temperatures (it is below -25 °C) the autotransformer (scheme 3) is entered into the scheme.

At inclusion of lamps of DRL the big starting current is observed (up to 2,5 · I). Process of the razgoraniye of the lamp lasts up to 7 minutes and more, repeated inclusion of the lamp is possible only after its cooling (10-15 minutes).


On the basis of lamps of DRL are developed and metallic-halogen lamps into which enter different iodides of metals that allows to receive the corresponding chromaticity of visible radiations are issued and to increase profitability of work of the lamp. The release of lamps of DRV, DRVED with the built-in active ballast is mastered. Such lamps join as normal glow lamps.

  1. Alexey

    the lamp was tired (throttle), or contact weak.

    To answer
  2. Alexander

    Good afternoon I have Yury in the yard of the lamp of drl-250 9 pieces, and so two lamps light up is not present, or one of these two lamps. All join from one photorelay. In what can be the problem? Thanks.

    To answer
  3. Dmitry

    Yury, good evening!
    I here LED (and not one) bought the bulb. Included, but rejoiced week. Then she began to blink. Replaced, the same effect. Raised energy saving (flight normal) the Question: what alteration of your LED lamp consists in. Well it would also be desirable to look at your catalog and to ask some more questions.

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  4. Belief

    Good afternoon Yury. Tell me please what increase in power consumption of the lamp of DRL 250 in use is connected with. For example consumption of power of street lighting in comparison with last year increased. Thanks.

    To answer
    • Yury

      Good afternoon, Vera. Work number of hours эл. lamps perhaps increased. Due to cloudier weather. Street lighting is controlled the photo the element? Try to adjust more precisely the photo cell of management vlk.otkl. lighting. In colder weather of trillion more time for ignition is required. As a result - increase in energy consumption. It is possible that the lamp works already long term. Try to replace the lamp with new and to mark its energy consumption, previously to write down indications эл. the counter with old trillion. For example within the hour. after to compare results. It is also possible to make measurement эл. current in эл. and to compare chains to factory data on эл. lamp. Not superfluous will be to check эл. scheme of your street lighting. Whether someone else to your connected trillion the street lighting.

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  5. Yury

    To distinguish the fused DRL from the worker not including it in эл. network it is possible so - on the lamp between the socle and the opaque surface there is the strip of pure glass 2 - 3 mm, through this pure glass it is possible to make out, the torch. If flask glass, torches, clean - the lamp working. If black and zakopchenny from within — that this lamp gleamed the. I use this experience at work. When replacing the lamp I look at purity, torches, if the flask black - means it is necessary just to replace the fused lamp. If the flask, torches, more or less clean, and the lamp did not shine - the problem with the throttle or contacts in lamp chains means. Still experience - if DRL 250 fused, and there is no other drlelka, it is possible safely will install instead of the fused DRL 250 the glow lamp on 500 W.

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    • Igor

      Hello Yury. Tell please. At us in the month 5 lamps of DRL 400 of w/C what fused it can be connected. Thanks.

      To answer
      • Yury

        Good afternoon Igor. Perhaps poor quality of lamps. Where DRL were made? Perhaps overestimated mains voltage. Lamps fused in the same lamp? If "yes" - that it is necessary to make lamp TR, it is possible to replace the throttle.

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