Difference between revisions of "Osram HQI-E"

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, it is quite difficult to achieve. Large wattage fixtures were never as popular as those for the typical E40 base lamps, meaning that finding and using the 150, 250 and 400W lamps is not attractive. 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.

The lamp's performance is slightly improved compared with typical metal hallide lamps, since better colour rendering is available on typical lam wattages. Lamps that have a daylight colour appearance have e 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 performing as typical quartz lamps, with lower performance than the ceramic lamps.