Author Topic: Running Mercury Vapor Lamps on High Pressure Sodium Ballast  (Read 3977 times)
form109
Guest
Running Mercury Vapor Lamps on High Pressure Sodium Ballast « on: December 31, 2008, 05:32:45 PM » Author: form109
i recently purchased a Lithonia 70 Watt HPS area lighting fixture,at the same time i also purchased a regent H-38-100-MDX 100 Watt Delux White Mercury Vapor Lamp,i wanted to see how
the mercury vapor lamp would behave on a high pressure sodium ballast,so i screwed it in the socket,the lamp started up red and warmed up to a cool white color,as expected,howeven a minute after reaching full brightness,the arc extinguishes,i,ve observed this closely and the lamp cycles on the 70 Watt HPS ballast,why is this so?
Logged
don93s
Sr. Member
****
Offline

Gender: Male
Posts: 335



Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #1 on: December 31, 2008, 05:43:33 PM » Author: don93s
When a MV warms up, it needs 130v across the lamp to stay lit which means the ballast needs an open voltage of over 200v. Your HPS ballast is only 120v open output since HPS lamp only needs 55v across it when fully warmed up. However, if you ever decide to check with voltmeter, be sure to disconnect the ignitor or meter will be damaged!

If I recall, lamp voltage must not exceed 2/3 of ballast open voltage or it will cycle.
« Last Edit: December 31, 2008, 05:45:39 PM by don93s » Logged
form109
Guest
Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #2 on: December 31, 2008, 06:05:01 PM » Author: form109
does running the Mercury Vapor Lamp in the fixture cause harm to the Ballast?

im already sure if i continue using the lamp,the cycling will kill the ignitor.

the label says the ballast provides 1.6 Amps,what is the opperating current
of a 100 watt mercury vapor lamp?
Logged
don93s
Sr. Member
****
Offline

Gender: Male
Posts: 335



Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #3 on: December 31, 2008, 06:57:25 PM » Author: don93s
I doubt running MV will hurt the ballast, but yeah the cycling will wear the ignitor.

The operating current for a 100w MV is around .85-.95 amp fully lit, so yeah it is being overdriven when fired up on 70w HPS.
Logged
form109
Guest
Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #4 on: December 31, 2008, 07:29:49 PM » Author: form109
Thanks,Don!!!
Logged
TudorWhiz
Hero Member
*****
Offline

Gender: Male
Posts: 962


WWW
Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #5 on: January 01, 2009, 03:22:41 AM » Author: TudorWhiz
also depending on ignitor, if its a 3 contact ignitor it may damage the ballast from cycling...but 2 contact ignitor will NOT damage the ballast
Logged

For pictures of my streetlight collection and other streetlight pictures with some various pictures that are not in this website, please visit http://www.galleryoflights.org/  under GullWhiz

Administrator of Galleryoflights.org

form109
Guest
Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #6 on: January 01, 2009, 03:25:24 AM » Author: form109
well its a 3 contact starter,but i only let it cycle 3 times so it probably didnt hurt the ballast or ignitor at all.
Logged
lightman64
Sr. Member
****
Offline

Gender: Male
Posts: 357


Zero 88 Lighting Controls Rule!


Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #7 on: January 01, 2009, 06:15:20 PM » Author: lightman64
i wouldn't do that myself, for fear of expolsion or something bad.....
Logged

The future of street lighting is Induction, not nasty HPS lights or cr@ppy LED lights!
Preheat CFL's should make a comeback!

form109
Guest
Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #8 on: January 01, 2009, 06:21:28 PM » Author: form109
there's no risk of lamp explosion at all,the only bad thing that will happen is possible damage to the ballast,and certain destruction of the ignitor if i let the lamp continue opperating on the ballast,it was just a test to see how the lamp would look,until i get a  proper replacement bulb.
Logged
lightman64
Sr. Member
****
Offline

Gender: Male
Posts: 357


Zero 88 Lighting Controls Rule!


Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #9 on: January 01, 2009, 06:22:49 PM » Author: lightman64
oh ok. well im not as expercened in sodium vapor as you are. i mostly deal with mercury vapor.
Logged

The future of street lighting is Induction, not nasty HPS lights or cr@ppy LED lights!
Preheat CFL's should make a comeback!

form109
Guest
Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #10 on: January 01, 2009, 06:33:10 PM » Author: form109
i wouldnt say im the most experienced,as this is my first High Pressure Sodium Fixture,the voltage provided by the hps is simply to low to keep the mercury vapor lamp lit.
« Last Edit: January 01, 2009, 06:35:22 PM by form109 » Logged
lite_lover
Sr. Member
****
Offline

Gender: Male
Posts: 276



Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #11 on: January 01, 2009, 06:45:58 PM » Author: lite_lover
Yep,the voltage is too low to stay lit. Are you planning to get a 100W MV ballast or fixture?
Logged

The brighter the better.

form109
Guest
Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #12 on: January 01, 2009, 06:52:01 PM » Author: form109
Yep,the voltage is too low to stay lit. Are you planning to get a 100W MV ballast or fixture?

i would but 100 watt mercury vapor fixtures seem to be more expensive,only the 175 watt is avaliable around here,and i cant find a 100 watt mercury ballast,i might try metal halide.
Logged
mercuryvaporisking
Jr. Member
**
Offline

Gender: Male
Posts: 62


Another day and another dollar at work!


Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #13 on: January 14, 2009, 10:59:33 AM » Author: mercuryvaporisking
If you did not disconnect the ignitor before operating the MV bulb then you probably fried the Starting probe in the bulb. Try it out on a regular ballast to see if it will light anymore. What I do at work is if a ignitor ever goes bad on our 100watt pulse start MH lights I will install a 175watt probe start bulb on the existing 100watt pulse start ballast and it will work fine. Not full brightness but I have had 2 going now for almost a year and no problems. The color is off from the others but same amount of lumens,It's either this or convince them to get replacement ignitors which they don;t they just get new ballast instead, So why waste a $80 ballast cause of ignitor failure? I keep them going. I also tried a MV bulb on a HPS ballast and forgot to take the ignitor off and I cooked the starting probe in the MV bulb so it was useless afterwards without an ignitor.
Logged

Same stuff, Different Day!

form109
Guest
Re: Running Mercury Vapor Lamps on High Pressure Sodium Ballast « Reply #14 on: January 14, 2009, 01:19:26 PM » Author: form109
the starting probe wasnt fried,however during the off periods of cycling,the ignitor would make a weak arc appear outside the arctube.
Logged
Print 
© 2005-2014 Lighting-Gallery.net | Powered by SMF 1.1.19 | SMF © 2013, Simple Machines