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Difference between revisions of "Osram HQI-E"
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These type of double-ended lamps were used sometimes for lighting exterior areas, especially for higher powered lamps but the most frequent application was indoor accent lighting with lower wattages. The lamp was relatively affordable (for a metal hallide lamp) and compact, having a successful niche until LED lamps appeared. Since they are very compact light sources it should be noted that heat output is very high, making the lamp unsuitable for open-air operation, seriously limiting flexibility. Another very important limitation is caused by the mandatory operating position and relatively short lamp life. While lamp warm up time is low, with the lamp achieving high output quite quickly, they are slow to restart, 10 minutes pauses not being uncommon. Both high pressure mercury vapour as well as sodium vapour ballasts can be used if provided with a suitable ignitor. | These type of double-ended lamps were used sometimes for lighting exterior areas, especially for higher powered lamps but the most frequent application was indoor accent lighting with lower wattages. The lamp was relatively affordable (for a metal hallide lamp) and compact, having a successful niche until LED lamps appeared. Since they are very compact light sources it should be noted that heat output is very high, making the lamp unsuitable for open-air operation, seriously limiting flexibility. Another very important limitation is caused by the mandatory operating position and relatively short lamp life. While lamp warm up time is low, with the lamp achieving high output quite quickly, they are slow to restart, 10 minutes pauses not being uncommon. Both high pressure mercury vapour as well as sodium vapour ballasts can be used if provided with a suitable ignitor. | ||
Overall, | Overall, HQI-E lamps are a mixed success. Some lamps have very good performance, in colour reproduction and service life, others are below average. Most of the product range has widely different specifications which means that a specific lamp has to researched in advance for desirable features. HQI-E lamps that have the internal shroud and are designed for open luminaries should generally be avoided as they have much reduced performance that is significantly below even to standard high pressure mercury vapour lamps, as they have only 6000 hours lifetime and they age quite quickly. | ||
== Understanding manufacturer data == | == Understanding manufacturer data == | ||