The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Industrail Control Panel bonding per 409.108
by sparkyinak
Today at 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 10
sparkyinak 9
Texas_Ranger 8
Potseal 6
Who's Online
2 registered (sparkyinak, LongRunner), 90 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 3 1 2 3 >
Topic Options
Rate This Topic
#61164 - 01/18/06 07:28 AM Mercury Vapor bulbs
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
In some parking lot bulbs I'm replacing, will a 250 watt (M138) run in a 400 watt 277/480 volt mercury vapor fixture?
_________________________
The Golden Rule - "The man with the gold makes the rule"

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#61165 - 01/18/06 08:04 AM Re: Mercury Vapor bulbs
mshaw Offline
Member

Registered: 01/11/06
Posts: 45
Loc: Fairborn, Oh, USA
I do not think so. I believe that the ballast and the lamp are matched so only a 400 watt lamp will work.

Top
#61166 - 01/18/06 08:22 AM Re: Mercury Vapor bulbs
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
I'd advise against trying. While the bulb might fit in the socket, the igniter, capacitor, and ballast are all sized to the bulb. Having the wrong bulb in is likely to result in a very short life for the ballast.

While you're changing ballasts- why not upgrade to Metal Halide? MH bulbs do not decrese in brightness as they age, as mercury bulbs do, yet still give a clean white light.

Top
#61167 - 01/18/06 08:31 AM Re: Mercury Vapor bulbs
Old Town Offline
Member

Registered: 11/24/05
Posts: 21
Loc: Dallas,TX USA
About 3 years ago I relamped about 10 70W med. base HPS lamps. I was out at the same place a couple of months ago and I had to replace a ballast. Much to my suprise the ballast was 100W. Lamp and ballast life seem to be uneffected by this mismatch. But I would not reccomend it.


[This message has been edited by Old Town (edited 01-18-2006).]

Top
#61168 - 01/18/06 09:10 AM Re: Mercury Vapor bulbs
CTwireman Offline
Member

Registered: 02/07/02
Posts: 839
Loc: Connecticut, USA
 Quote:
MH bulbs do not decrese in brightness as they age, as mercury bulbs do, yet still give a clean white light.


That's not true at all. All HID lighting sources have declining lumen output as they age. HPS has the best lumem maintenance, followed by MH and then MV.

The basic probe start MH lamps have poor lumen maintenance, especially as they near the end of their rated life. However, pulse start and the newer ceramic metal halide systems have pretty well conquered this problem.

Peter
_________________________
Peter

Top
#61169 - 01/18/06 10:11 AM Re: Mercury Vapor bulbs
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
mshaw, I think you might be right. Also, both sockets are the larger Mogal base type.
_________________________
The Golden Rule - "The man with the gold makes the rule"

Top
#61170 - 01/18/06 10:15 AM Re: Mercury Vapor bulbs
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
Also, it says 480 volt on the fixture, did not measure it but it must be 277 volt. Don't think those are 480 from socket to center. Gotta be 277v.
_________________________
The Golden Rule - "The man with the gold makes the rule"

Top
#61171 - 01/18/06 12:08 PM Re: Mercury Vapor bulbs
mxslick Offline
Member

Registered: 10/24/04
Posts: 785
Loc: Atomic City, ID USA
The voltage referrs only to the fixture's input voltage, not the voltage seen by the lamp. IIRC merc vapors operate at around 80 volts once the arc is struck.

And the 250 watt bulb in the 400 watt fixture is an extremely bad idea. If you're lucky all that will happen is the lamp won't light. Otherwise you could easily have bulbs exploding or ballasts going down in flames.

Either get the right bulbs or get rebuild kits that will have the bulb, ballast and any other essentials.
_________________________
Stupid should be painful.

Top
#61172 - 01/18/06 02:24 PM Re: Mercury Vapor bulbs
Rewired Offline
Member

Registered: 01/01/06
Posts: 567
Loc: Hamilton, Ontario, Canada
If you are going to change everything you might as well go to HPS if colour is not an issue.. I believe the "lumens per watt" is greater for HPS than metal halide or old school mercury...
Also, double check your input voltage.. I once put a ballast in a fixture that was labelled " 230V". and had a " 115 / 230V" dual rated ballast.. too bad for me the input WAS 600V!
it looked spectacular for about 6 seconds when everything was turned on!

Top
#61173 - 01/18/06 05:16 PM Re: Mercury Vapor bulbs
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
Aldav, I admit I was surprised the first time I encountered it, but there ARE ballasts out there that take 480v...two 'hots'...for their input voltage.
I was working on such a system just last week.

Top
Page 1 of 3 1 2 3 >



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals