Author Topic: OSRAM 1959 - Nuovi tipi lampade a vapori di mercurio (with translation)  (Read 1133 times)

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Olav Kettner
OSRAM 1959 - Nuovi tipi lampade a vapori di mercurio (with translation) « on: August 17, 2022, 02:21:23 PM » Author: Olav
An interesting report of the launch of the new HQL and HQL/R lamps in Italy in 1959.
I can not speak Italian. So I typed the text manually and translated it with Google. It will suffice for general understanding in this quality.
Interesting: OSRAM HQL/62 125W, 250W and 400W MV lamps are the lamps with the yellow coating.



Source: OSRAM notiziario, Numero 3-4-5 Ottobre 1959, pagina 16

Source: OSRAM notiziario, Numero 3-4-5 Ottobre 1959, pagina 17

Text translation:

New types of mercury lamps

The use of this lamp records a constant rise which is motivated both by its remarkable performance, increasingly appreciated by the consumer, and by the increasingly numerous applications in relation to new specific uses and the expansion and rationalization of modern lighting. Also in relation to this, OSRAM has taken great care of this sector trying to widen its range where possible to better respond to the increased and refined needs of the market.

Before discussing the characteristics of the new types, which we announce with these notes, we wish to give a quick glance at the two most known and used varieties of mercury vapor lamps which are: the normal ones (distinguished by our initials HQA with ellipsoidal ampoule and HgH with cylindrical ampoule) to those with a fluorescent bulb (marked by our initials HQL).
Among the discharge lamps, the mercury vapor lamps are undoubtedly the lamps that best lend themselves to various practical applications due to their teen characteristics, namely: shape, size, duration and high luminous efficiency which allows to reduce energy consumption to about one third compared to normal incandescent lamps. For this reason they are particularly suitable for those uses where high-power and long-lasting luminous centers are required, including: public lighting; lighting of large industrial warehouses; lighting of large outdoor areas (railway parks, ports, docks, warehouses, etc.); decorative lighting of building facades.
The normal mercury lamps consist - as known - of an internal bulb, which contains the mercury vapors and the electrodes, and of the normal external bulb which serves for protection and for a better distribution of the luminous flux.
The mercury vapors traversed by the electrical discharge emit a blue-white light, rich in green, blue and yellow radiation, but low in red radiation. OSRAM manufactures these types in the following powers: 50, 80, 125, 250, 400 and 1000 Watt.
The mercury vapor lamps have obtained - as mentioned - a flattering success and one of the most recent proofs of this has been the adoption by the Soc. Concessioni e Costruzioni Autostrade of the OSRAM HQL 250 W which excellently performs its works on the Autostrada del Sole.

The series of high power mercury vapor lamps has been enriched with the following types: HQA 700 W, HQL 700 W and HQL 2000 W.
The latter above all constitutes an interesting realization as it is a lamp capable of providing exceptional performance, whose luminous flux corresponds to that which would emit 50 fluorescent lamps of 40 W or 7 incandescent lamps of 1000 W.
In addition to these types of supplementary character, two are added which, by modifying certain characteristics, appear on the market for specific applications and to solve well-defined lighting problems:
Yellow light bulb lamps - These lamps that OSRAM presents in 3 powers:
HQL 125W / 62, 250W / 62, 400W / 62 differ from fluorescent lamps for the yellow color of the light emitted.
They can replace sodium vapor lamps where a non-monochromatic yellow light is required or when the latter cannot be used for particular system requirements.
they are particularly suitable for traffic lighting (road crossings, igresses and motorway exits, over and underpasses and, in general, all dangerous points where it is necessary to draw particular attention to those who drive vehicles and pedestrians themselves) and for the decorative lighting of interiors and exteriors.

Mercury Fluorescent Lamps with Built-in Reflector - HQL 250 W / R and HQL 400 W / R fluorescent mercury lamps with built-in reflector have recently been introduced. Said lamps, fig. 6, which have the same electrical characteristics and therefore can be used with the same ballasts as the corresponding fluorescent mercury lamps of equal power, have the upper part of the bulb covered with a reflective layer which conveys the most of the luminous flux. The reflecting layer, being partially transparent, allows a small amount of light to pass upwards (15%) and therefore allows the upper parts of the rooms to be softly illuminated, avoiding too high luminance contrasts that would require tiring and continuous eye adaptations.
The HQL / R lamps can be advantageously used in industrial street lighting systems where the light centers are subject to dust and get dirty very easily or in other systems where it is necessary to make use of large-power and small-sized lighting bodies.
The characteristics of the HQL / R lamps are shown in the following table, while fig. 5 shows the distribution of light intensities.
The lamps, similar to the normal fluorescent mercury lamps, are made of hard glass and therefore resistant to humidity and high temperatures and can operate in any position. These elements further confirm the suitability of these types of lamps for the performance to which they are called.

Fig. 1) - Industrial lighting - CRDA warehouse in Monfalcone with an area of about 10,000 square meters. _ 96 HQL lamps of 400 and 700 W allow an average illuminance of 100 lux.

Fig. 2) - Public lighting - Via Pasquale Paoli in Como - 112 250 W HQL lamps on a stretch of m. 2,300 give an average illuminance of 24 lux.

Fig. 3) - Public lighting - Piazza della Stazione in Pavia - 400 W HQL lamps on 3-arm candelabra.

Fig. 4) - Decorative lighting - Suggestive night vision of the Chiaravalle Abbey - 27 fluorescent and 4 incandescent bulb lamps were used for a total of 12,750 W.

Fig. 5) - Distribution curve of the light intensities of the HQL / R lamp at 250 W.

Fig. 6) - HQL / R lamp - Note the internal bulb which contains the mercury vapors and the electrodes.

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