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Most manufacturers have been releasing lamps for many decades and constantly improved technology so that lamps had a stabler, predictable lifetime and slightly improved colour stability due to manufacturing progress. | Most manufacturers have been releasing lamps for many decades and constantly improved technology so that lamps had a stabler, predictable lifetime and slightly improved colour stability due to manufacturing progress. | ||
Compared with Philips | Compared with Philips HPI lamps, the HQI-E range is much more diverse, offering a wider selection of wattages as well as more white colour choices. However, service lifetime and white light appearance varies much more than on Philips lamps, being less predictable based on some widely used assumptions in general lighting. | ||
{{footnotes| | {{footnotes| | ||