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Difference between revisions of "Osram HQI-T"
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== Review == | == Review == | ||
These metal hallide lamps are well suited for indoor lighting due to their moderately high power rating and good colour reproduction. Although outdoor lighting is entirely possible, especially for higher power rated lamps. Large wattage fixtures were very popular especially for flood lighting with boxy, asymmetric or symmetric lighting patterns. The most popular power ratings were 250 and 400 Watss. The lamp itself fares well in terms of light output but the point light source nature of the lamp relegates it to accent or directional rather than general lighting. | These metal hallide lamps are well suited for indoor lighting due to their moderately high power rating and good colour reproduction. Although outdoor lighting is entirely possible, especially for higher power rated lamps. Large wattage fixtures were very popular especially for flood lighting with boxy, asymmetric or symmetric lighting patterns. The most popular power ratings were 250 and 400 Watss. The lamp itself fares well in terms of light output but the point light source nature of the lamp relegates it to accent or directional rather than general lighting. | ||
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. | |||
The lamp's performance is improved compared with typical metal hallide lamps, since very high colour rendering is available on some lamps. Unfortunately, the datasheet is highly convoluted as lamps with different bases, colour renderings and white appearance are present in the same product range. Lamps that have a daylight colour appearance have very high colour rendering index for a quartz metal hallide lamps but they suffer the same lumen output degradation as cool white lamps. Overall, cool white and daylight colour appearance lamps have the best light output stability during service life. Of course, compared with ceramic metal hallide lamps, HQI lamps are faring slightly better than average but they are still lower performing than ceramic lamps. | The lamp's performance is improved compared with typical metal hallide lamps, since very high colour rendering is available on some lamps. Unfortunately, the datasheet is highly convoluted as lamps with different bases, colour renderings and white appearance are present in the same product range. Lamps that have a daylight colour appearance have very high colour rendering index for a quartz metal hallide lamps but they suffer the same lumen output degradation as cool white lamps. Overall, cool white and daylight colour appearance lamps have the best light output stability during service life. Of course, compared with ceramic metal hallide lamps, HQI lamps are faring slightly better than average but they are still lower performing than ceramic lamps. | ||