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Ruptured 70w HPS

Ruptured 70w HPS

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I rarely find exploded HPS lamps while at work in the field, so I thought ide post it. Whats interesting about this one is the blast mustve been so strong that it not only caused the outer envelope to shatter, but also notice the upward curved lead-in wires to the arctube. I took this photo before opening the fixture. This is a chinese generic floodlight that I commonly see branded under the "Grandlite" and "Sunlite" names. The ballast inside was cooked, coil was completely black. Wouldve been interesting to have been there when this thing went nuclear

80w.jpg 20180407_233627.jpg 20180310_212745.jpg 20180124_225108.jpg

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Filename:20180310_212745.jpg
Album name:BlueHalide / New album
Keywords:Lanterns
File Size:519 KB
Date added:Mar 10, 2018
Dimensions:2464 x 1848 pixels
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Date Time:2018:03:10 21:27:45
DateTime Original:2018:03:10 21:27:45
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LegacyLighting
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Blake


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Mar 11, 2018 at 12:31 AM Author: LegacyLighting
That is a spectacular failure. Kerboom!
HomeBrewLamps
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SodiumVapor 105843202020668111118 UCpGClK_9OH8N4QkD1fp-jNw majorpayne1226 187567902@N04/
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Mar 11, 2018 at 12:38 AM Author: HomeBrewLamps
A few days ago I put a 400W HPS arctube (busted cathode rattling around) on a 1000W Ballast hoping to nuke it, all that happend was a hairline crack on the side and a "poof" . Was disappointed. I'm a bit of a pyro... "A bit" being an understatement.....

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Medved
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Mar 11, 2018 at 01:32 AM Author: Medved
Well, cooked ballast means the lamp got overpowered. And it was not just the factor of 2.5 (as with the 400W on a 1kW ballast), here the ratio was likely way greater...

No more selfballasted c***

streetlight98
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Mike McCann


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Mar 11, 2018 at 08:48 AM Author: streetlight98
Wow never seen a HPS explode the outer envelope! I've had Philips lamps explode but only the arc tube, not the outer envelope. Those were on properly-functioning ballasts too, so very weird. Philips lamps behave strangely it seems anyway, at least the Alto ones.

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don93s
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Mar 11, 2018 at 10:00 AM Author: don93s
Looks like this lamp was possibly exposed to nearly full mains current at full run-up if the choke ballast was shorted.
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Mar 11, 2018 at 10:08 AM Author: Lumex120
That's crazy, but the ballast failure could have caused this. Did you fix this or replace the fixture?

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Max
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Mar 11, 2018 at 10:26 AM Author: Max
The burner must have failed very violently in order to get such result and I don't see how this could have happened other than via a severe overdrive. HPS lamps runs normally at around 1 bar, so there is no way this could have happened under normal operating conditions.
BlueHalide
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Mar 11, 2018 at 05:09 PM Author: BlueHalide
I replaced the entire fixture with a NOS proper RAB 70w HPS microflood we had at the shop since this customer wasnt too far away. Plus I didnt feel like trying to install a new 70w ballast in this generic chinese flood, the ballast that came out of it is smaller than a proper Advance or GE ballast.

The fried ballast did in fact measure a dead short, meaning the lamp was connected directly to the 120v 30A circuit. Whats interesting is the 30A breaker didnt trip, which usually happens in the event of a ballast failure like that.
xmaslightguy
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zzz


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Mar 11, 2018 at 07:28 PM Author: xmaslightguy
That must have given one heck of an EOL show.
I guess this shows what would happen if you attempted to run a HPS lamp without a ballast.

I wonder if the lamp went EOL & that's what caused the ballast to fry, or if the ballast was just cheap crap and simply fried from age?

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BlueHalide
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Mar 12, 2018 at 09:26 AM Author: BlueHalide
There are 24 of these same lights installed around that building, this is one of those customers who wont call for a relamping until nearly half of the lights are completely out. Running until EOL is very hard on the cheaper generic gear inside these lights. That day I replaced 6 ignitors as well as all lamps. This was the only fixture that was replaced completely.
WestinghouseCeramalux
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Vintage HID Collector


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Mar 12, 2018 at 09:37 AM Author: WestinghouseCeramalux
Hmmm...last time that I saw an HPS lamp like this was when I shot an EOL Tungsram LU150.

A man has two lives to live, and the second one begins when he realizes he only has one.

Better to remain silent and be thought a fool than to speak and to remove all doubt.

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Mar 12, 2018 at 11:12 AM Author: wattMaster
How old were these floodlights?

SLS! (Stop LED Streetlights!)

BlueHalide
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Mar 12, 2018 at 07:35 PM Author: BlueHalide
Floodlights were installed in 2009, I believe this is the third or fourth relamping. Out of the 24 fixtures, I dont think any still contain the original ignitor since the customer lets these go until they have been cycling for months.
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