Author Topic: Are SBMVs still useful now in days?  (Read 2293 times)
Binarix128
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Are SBMVs still useful now in days? « on: July 05, 2020, 09:43:11 PM » Author: Binarix128
I wonder if those things are still useful now in days. That's curious: SBMVs are still being sold on Ebay and in some electrical stuff stores here, despite are barely more efficent than an incandescent lamps and L*Ds are everywhere. Are SBMVs still being used as retrofit or have spetial applications where other lighting can't? ???
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dor123
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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 #3 on: July 06, 2020, 02:26:51 AM » Author: Binarix128
I've also heard about blacklight SBMVs, but I don't know if those are still being sold. Normal coated 160W, 250W and 500W SBMVs are as cheap as a piece of cake with coffee or less here. Maybe those are still being used in many places here. When I went to Playa Ancha in my vacations in Valparaíso, I saw two 160W SBMVs at the entrance of a grocery store, and that's the only place where I saw a SBMV being used.

@dor123 I don't know if you're right with that the SBMVs are designed to run based up. The manufacturer of my SBMVs shows that can run in any vertical position.

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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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Re: Are SBMVs still useful now in days? « Reply #5 on: July 06, 2020, 05:00:18 AM » Author: Medved
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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Re: Are SBMVs still useful now in days? « Reply #6 on: July 14, 2020, 01:29:53 AM » Author: Binarix128
I think that running the SBMVs based up will deteriorate its physical integrity, since the extreme heat of the filament and the arctube is directly going to the glass tube, the bulb glue, the metal base and its insulator.
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