Re: Are SBMVs still useful now in days? « Reply #1 on: July 05, 2020, 11:26:29 PM » Author: dor123
SBMV lamps with Eu:YPV phosphor coating and >160W have the same efficiency as quartz halogen lamps, with 160W SBMV produces the same output as 200W incandescent. They have longer lamp life than incandescents and halogens if burned base up (Horizontal and based down operation shortens the filament life, and reduce lumen maintenance because of evaporated tungsten on critical parts of the outer jacket, with horizontal burning can also cause the lamp to cycle). SBMV lamps aren't popular these days here in Israel. Most uses LEDs.
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	Re: Are SBMVs still useful now in days? « Reply #2 on: July 06, 2020, 01:42:15 AM » Author: Medved
Practically special applications only (reptile bulbs, combining UV skin disinfection with IR heat in a similar way as contained in sun rays, so allows the creatures to regulate their exposure correctly,...). For general lighting they were originally a kind of higher efficacy replacement for long life incandescents in old installations (here it means a pre-HID era installation), but long ago they were replaced by regular MV or other HID when practically all fixtures for such use were available equipped with the ballast directly for the given HID. And lately the CFLs sealed their fate completely.
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	Re: Are SBMVs still useful now in days? « Reply #4 on: July 06, 2020, 04:08:57 AM » Author: dor123
When the lamp used base-down, all of the evaporated tungsten accumulates at the front part of the lamp, blocking lot of light. When the lamp used base-up, the evaporated tungsten accumulates at the neck of the lamp, blocking much less light, and improving lumen maintenance.
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Are SBMVs still useful now in days? « Reply #5 on: July 06, 2020, 05:00:18 AM » Author: Medved
Quote from: dor123 on July 06, 2020, 04:08:57 AM When the lamp used base-down, all of the evaporated tungsten accumulates at the front part of the lamp, blocking lot of light. When the lamp used base-up, the evaporated tungsten accumulates at the neck of the lamp, blocking much less light, and improving lumen maintenance. When base down, it accumulates in the crown, but most of the lights comes from the sides, so not much lumen loss from that (my guess few percents over the total life). Way more potent cause of lumen loss is the electrode sputtering (even when white) within the arctube. And that is quite position independent...
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