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== Features == | == Features == | ||
*Diffuse internal ovoid coated bulb | |||
*Internal high pressure quartz discharge tube | *Internal high pressure quartz discharge tube | ||
*E40 base | *E40 base | ||
*Requires ignitors except on "S" designated 250W and 400W lamps | *Requires ignitors except on "S" designated 250W and 400W lamps | ||
*Color rendering index Ra of | *Color rendering index Ra of 69 | ||
*Typical lifetime of 20.000 hours | *Typical lifetime of 20.000 hours | ||
*Luminous efficacy of 72 to 85 lumens/watt | *Luminous efficacy of 72 to 85 lumens/watt | ||
*Cool white or daylight colour designation (4500 or 6700 K colour temperature) | *Cool white or daylight colour designation (4500 or 6700 K colour temperature) | ||
*Vertical or horizontal operating position | |||
== Lamp control gear == | == Lamp control gear == | ||
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** Philips SI or compatible parallel ignitor for 5000 Volt pulses (except "S" designated lamps) | ** Philips SI or compatible parallel ignitor for 5000 Volt pulses (except "S" designated lamps) | ||
** May require power factor correction capacitor for balancing line load | ** May require power factor correction capacitor for balancing line load | ||
|style="vertical-align:top" | | |style="vertical-align:top" | | ||
| | | | ||
[[Image:Philips HPL-N 250W.jpg|Philips | [[Image:Philips HPL-N 250W.jpg|Philips HPI Plus 250W]] | ||
|} | |} | ||
</div> | </div> | ||
== Best retro purpose == | == Best retro purpose == | ||
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|- style="background:#efefef;" | |- style="background:#efefef;" | ||
! Designation !! Base !! Lamp wattage !! Luminous flux !! Colour appearance !! Colour Temperature !! Colour Rendering Index (Ra8) !! Life (to 50% failures) | ! Designation !! Base !! Lamp wattage !! Luminous flux !! Colour appearance !! Colour Temperature !! Colour Rendering Index (Ra8) !! Life (to 50% failures) | ||
|- | |- | ||
| MASTER HPI Plus 250W/745 BU E40 CRP/SLV || E40 || 250 W || 18000 lm || Cool White || 4500 K || 69 || 20000 hours | | MASTER HPI Plus 250W/745 BU E40 CRP/SLV || E40 || 250 W || 18000 lm || Cool White || 4500 K || 69 || 20000 hours | ||
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|- | |- | ||
| MASTER HPI Plus 400W/767 BU E40 CRP/SLV || E40 || 400 W || 32500 lm || Daylight || 6700 K || 69 || 20000 hours | | MASTER HPI Plus 400W/767 BU E40 CRP/SLV || E40 || 400 W || 32500 lm || Daylight || 6700 K || 69 || 20000 hours | ||
|- | |- | ||
|} | |} | ||
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Notes: | Notes: | ||
* some lamps have an integrated internal starter and do not require an external ignitor, presented with the "S" designation; | * some lamps have an integrated internal starter and do not require an external ignitor, presented with the "S" designation; | ||
* | * "P" means protected lamp, suitable for open air use; | ||
* "BU" means base up operation while "HOR" means horizontal operating position | * "BU" means base up operation while "HOR" means horizontal operating position. | ||
== Durability and Repair-ability == | == Durability and Repair-ability == | ||
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! Features !! Flaws | ! Features !! Flaws | ||
|- | |- | ||
| High light output in very compact package || | | High light output in very compact package || No lower wattage lamps available | ||
|- | |- | ||
| High efficiency, long life, average colour rendering || Quite expensive lamps | | High efficiency, long life, average colour rendering || Quite expensive lamps | ||
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| Mostly omni-directional light || Sensitive to operating position and unbalanced wearing | | Mostly omni-directional light || Sensitive to operating position and unbalanced wearing | ||
|- | |- | ||
| | | Reduced lamp glare, quick lamp start || Slow restart, requires bulky, heavy, complex lamp gear | ||
|} | |} | ||