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Difference between revisions of "Osram HQI-T"
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Metal Hallide lamps are still widely used on commercial, industrial and architectural lighting but in these applications LED lamps are quickly replacing them due to much better performance, lower energy consumption and easy servicing. Light appearance is coll white or daylight, depending on lamp model, with good colour reproduction and low ultraviolet emission. The lamp can be used indoors as well as outdoors, when intense lighting is required as most surrounding look quite pleasing being light with new lamps. With the most common gear, an electromagnetic ballast along with an ignitor, flicker is noticeable. | Metal Hallide lamps are still widely used on commercial, industrial and architectural lighting but in these applications LED lamps are quickly replacing them due to much better performance, lower energy consumption and easy servicing. Light appearance is coll white or daylight, depending on lamp model, with good colour reproduction and low ultraviolet emission. The lamp can be used indoors as well as outdoors, when intense lighting is required as most surrounding look quite pleasing being light with new lamps. With the most common gear, an electromagnetic ballast along with an ignitor, flicker is noticeable. | ||
Exterior lighting is a good application as most gardens and outside areas are well showcased. The lamps themselves do release some heat meaning that closed fixtures are not well suited if not specifically built for this purpose. Care should be taken when using these metal-hallide lamps as they are sensitive to the operating position especially when inside enclosed fixtures. Compact, boxy symmetric and asymmetric fixtures were popular. Improper heating of lamp can destroy it prematurely and present a safety hazard so special precaution should be exercised. Even if lamp warm up time is low, achieving high output quite quickly, they are slow to restart, 10 minutes pauses not being uncommon. | |||
With adequate care and good ventilation, HQI-T metal hallides can be used vertically, in a freestanding position as mercury vapour lamps but lifetime will be reduced. HQI-T lamps of lower wattages are slightly more sensitive to operating position than higher wattage ones. Lamps age differently and this means that a series of lamps may exhibit different colour intensity and light intensity depending on wear and group replacement should be considered to maintain uniformity. Just as well, lamps should be replaced as soon as light and colour uniformity is affected, as old lamps present a higher risk of catastrophic failure. | |||
These type of lamps were used for lighting exterior areas especially in the case of higher powered lamps while the most frequent application of low powered ones was indoor accent lighting. The lamp was relatively affordable (for a metal hallide lamp) and small sized, 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. While both high pressure mercury vapour and high pressure sodium gear and fixtures can be used, the lamp works closer to designed parameters when used with inductive ballasts for sodium high-pressure vapour lamps and a suitable ignitor added on the circuit as required. | |||
Overall, this range of lamps is moderately successful for retro purposes as the lamps are quite efficient and have a great variety of wattages and colour designations. Colour rendering is also very good, but only for certain lamps and wattage ratings, so careful analysis of datasheets is recommended before purchase and installation. Fixtures must be designed to house this type of lamp, meaning that a lone lamp is not a good choice and a complete system must be found especially in the case of lower powered lamps that use the bi-pin base as they are specialist items. | |||
== Understanding manufacturer data == | == Understanding manufacturer data == | ||