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HPL-N lamps are high pressure mercury vapour lamps that have been produced, with somewhat similar properties, since the 1950s. The lamp's fluorescent coating technology dates back to around the end of 1930s while modern lamps were essentially manufactured as early as 1970s and are a result of subsequent improvements up until that time. The market for these lamps grew as industry and commercial activity recovered after the Second World War, meaning that research was justified by large sales. | HPL-N lamps are high pressure mercury vapour lamps that have been produced, with somewhat similar properties, since the 1950s. The lamp's fluorescent coating technology dates back to around the end of 1930s while modern lamps were essentially manufactured as early as 1970s and are a result of subsequent improvements up until that time. The market for these lamps grew as industry and commercial activity recovered after the Second World War, meaning that research was justified by large sales. | ||
The lamp technology was an improvement of previous lamps that used a clear envelope and had an alumino-silicate glass where the mercury discharge was constrained. Colour reproduction was | The lamp technology was an improvement of previous lamps that used a clear envelope and had an alumino-silicate glass where the mercury discharge was constrained. Colour reproduction was nonexistent, being so low as to render people and everything natural around them as being dead. Increasing the pressure and temperature of the mercury vapour gas discharge to emit more useful light and operation in any position was possible only with the advent of quartz discharge tubes. Colour reproduction was only slightly improved but lower wattage lamps were much more efficient. Up until late in production, the clear lamp was avoided except for street lighting and some industrial applications. Subsequently, mercury vapour lamps were heavily used in street lighting and industry. Colour rendering was the highest barrier to market success. Improvements focused on colour reproduction but energy efficiency and reliability increases were areas with best results. | ||
Development of fluorescent coatings that emit red light made the lamp more desirable although good flourescent powders were mass produced and cheap only in late 1970s. The lamps itself were running hot so fluorescent powders had to withstand temperature and UV-C exposure stress for many years while also emitting more light than the coating powder absorbed. The first generation powders had mild colour improvements but Yttrium Vanadate ones were highly successful and durable, making the lamp suited even for some indoor illumination, especially for deluxe lamps. Near the end of production deluxe lamps were very common and standard lamps such as the HPL-N were incorporating most developments specific to these top-of-the-line lamps. These improvements made high pressure mercury vapour lamps suited for industrial, commercial, street-lighting and even some occasional residential use. | Development of fluorescent coatings that emit red light made the lamp more desirable although good flourescent powders were mass produced and cheap only in late 1970s. The lamps itself were running hot so fluorescent powders had to withstand temperature and UV-C exposure stress for many years while also emitting more light than the coating powder absorbed. The first generation powders had mild colour improvements but Yttrium Vanadate ones were highly successful and durable, making the lamp suited even for some indoor illumination, especially for deluxe lamps. Near the end of production deluxe lamps were very common and standard lamps such as the HPL-N were incorporating most developments specific to these top-of-the-line lamps. These improvements made high pressure mercury vapour lamps suited for industrial, commercial, street-lighting and even some occasional residential use. | ||