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Difference between revisions of "Philips HPI Plus"
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== Suitability == | == Suitability == | ||
HPI Plus lamps are the best choice since they do not require specific fixtures for operation, their ovoid outer bulb allowing simple operation and less glare with possible operation as free standing, hanging, lamps. HPI-T lamps are much more effective for flood lighting but they require specific fixtures and have higher surface temperature, making them more susceptible to damage when improperly handled. Chinese branded lamps are much worse in all performance and quality metrics with shorter useful life, worse colour reproduction and and efficiency as a proper, stable mix of hallides required huge research investment that was too costly for Chinese producers. | |||
The best choice | The best choice are, probably, the 250 watt lamps as larger powered lamps are too powerful for most purposes. This lamp wattage was also cheaper as they were highly popular. Electro-magnetic ballasts or conventional gears are plentiful and can be used interchangeably with all manufactured lamps for a specific wattage and ignitors' performance is less critical as on high pressure sodium lamps. Lower rated power output gears can be used, but it is not recommended as colour reproduction and lamp lifetime will be reduced while higher powered ones damage the lamp due to over-stressing and is highly dangerous. | ||
Used lamp gears might work but old lamps are | Used lamp gears might work but old lamps are never desirable as they degrade much quicker than mercury vapour and sodium lamps. Rusted ballast may still operate but are a potential hazard while old, used lamps, may not have much useful life left and they may already exhibit some colour light emission issues. New old-stock lamps are the best choice, if available. | ||
== History == | == History == | ||