Metal Halide bulb and ballast...

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I found this on ebay and thought to my self that when I get a projector for my panel I will prob need a brighter source. What do you think of these http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2308237007&category=3212 ..its for a aquarium and the bal. is ext. 210 in and 175watt(how many lumens would this be). I think it would be possible to have one or two lights on and/or able to switch from one light to another, just a thought.

Also being a newbie to the site(not to forums in general) I did a search for a rca to vga connector(came up empty handed)..I saw it somewhere and was wondering if anyone had the site...
Thanxz don
 
Hi,

You can find some specs at

philips

$145 is a lot for a ballast, you should be able to get one for $50-100.
More important, the mogul socket only excepts very bulky lamps. You wont be able to get that light focused. Better look for G12/RX7s/FC2 socketed lamps. The G12/RX7s lamps are 'only' upto 150 watts though, but they still produce upto 11000 lumens.

You can find info for the 250W MH lamp at sylvania (product->US->lamps->hid->hqi->double ended)
16000 lumens!

Just looked on ebay:

250W ballast
Works also with MH lamps.

or

150W ballast
 
There are 2 types of ballasts. Magnetic (as on ebay) and electronic. I have no experience with electronic ballasts, but I've read that they produce more flicker. Magnetic ballasts are more sturdy and will only fail when you leave them powered on with a broken bulb or let them overheat.
Quality? No real difference between brands. Its just a coil 'n stuff.
 
while we are on the subject....
1. of the two types of ballasts, which type are most people using to retrofit?
2. i have seen magnetic ballasts at lowes, but i was under the immpression that we all need electronic ballasts, regardless of flicker. is this true?
3. MY MAIN QUESTION TO ADD!
does the ballast wattage have to be equal to the bulb wattage?
or can bulb wattage exceed ballast wattage?
what are the consequences? (brightness loss, longevity, fire?

basic questions that i have but curious and have not seen answered. thanks for any input.
i would like to use a 75 watt magnetic ballast at lowed with a double ended bulb and bracket like at hello lights.
 
I would tend to agree with rapsac about the magnetic ballasts being more reliable. One of the things I have forund is that you can put the magnetic ballast in its own box and use it remote so you dont have to deal with the heat, weight, and extra space that they take up in your projector design. The technical specs on the ballast will usually list a maximum lenght that you can use for a cord to the lamp socket from the ballast. The cord on my 1000watt ballast is about 8' or so.
On that 250watt ballast on e-bay, its a high pressure sodium ballast, It has a diffent ANSI # than the 250watt HQI. It is pulse start but there is probably differences in the voltage that it is sending to the bulb. It might underdrive or overdrive the bulb, either of wich is dangerous and could cause the bulb to fail/ and or explode. You defiantly need to make sure your specs are correct. The ANSI number for the magnetic HQI 250 watt ballast for the double ended lamp is M80, single ended HQI lamp is M138
I believe.
 
Yah, I noticed a 400 watt HQI bulb on e-bay that was single-ended, It also called out the use of a sodium ballast. "S51" I think.
I Know that some lamps can be used with ballasts that are similar to the origianal spec. I was looking at these metal halide "pulse ballasts" and wondering if they could also run the
Double ended HQI's. http://www.hidirect.com/framesets/ballast.htm
If the high pres. sodium will work on the 250watt HQI, thats pretty cool. I was eyeballing these bulbs:
http://www.bulbsource.com/MHDoubleEnded.htm
Namely the 250 and 400 watt ones. The price on the 250 watt bulb is very reasonable.
 
Basically you need an M80 ballast, either magnetic or electronic to run the double ended 250 watt HQI bulbs. Magnetic ballasts tend to be cheaper and more durable but they also take up more space and produce more heat than electronic.
 
Got this on eBay

I won this 250 watt M58 Metal Halide Lamp Ballast on eBay. I'm collecting parts to do a MKII type projector. Did I waste my money or will I be able to use this to run a double ended MH setup? 😕
 
hmmm mikkinner out of here runs a 250w hqi no worries on a 250w magnetic ballast, he coundnt get hold of an electronic ballast so he tried the magnetic type, aparently the hqi bulbs and cdm-t range have to be run on electronic, but ive found this case isnt true as the one that mike runs , runs no worries at all, also here in europe nearly all of the gear weather it being cdm-t or hqi runs on magnetic, so go and figure but it works, as for a cdm-t they actually put out 13000lm - 14000lm in the 150w package.

Trev
 
Ace...

Ace, please take no offense, none was meant. I noticed that I hadn't put the link to the auction in my previous posting, so I did another posting to include the link and I was merely re-stating my question. I had not seen your response in the mean time. My wording was intended to illustrate my ignorance, not imply yours.

I know little of ballasts other than that I need one for the 250W metal halide I want to put in my projector. I bought this on a whim, hoping to avoid having to buy Alan's and hoping it would prod me to start my project. Plans were to get the ballast, get the rest of the light components and lenses from DIY Labs and then construct an enclosure. In the meantime, hopefully a BenQ will miraculously materialize on the clearance rack of the local CompUSA.

Ace, thanks for your response and could you tell me what cdm-t is also?
 
n8

heya n8 no worries bud i didnt know wich way to take it so i thought id ask first before i took ofence to it, as u know on the net alot of the time people get taken the wrong way due to the fact not only cultral background but also understanding, its hard on here somtimes as there is no exspretion like there is talking face to face anyway enough of that.

ok the basic things u need to look for when knowing if a ballast is compitible is the ansi code, that is just a reference number for particular bulbs and sockets, its an easy way to match items with each other, now the harder way is to match it with the bulb wattage, bulb voltage and bulb current, basically the ansi saves the buyer from looking this stuff up.

now with your ballast we need to know what voltage it puts out to the lamp and the current we know the wattage is 250w, if the voltage and current is the same or within 3-5% it should work no problem on any bulb within reason, within reason because some bulbs require a higher strike or arc voltage then others, the hqi is like this but will and does work on a normal magnetic ballast, ill try to ask a mate of mine what ballast he uses on his 250hqi same as the diy labs bulb, ill try to get his ansi code to make life abit easier for u but im sure your ballast will work, but its best to make sure as saftey comes first and by no means am i going to be responsible for u loosing your eye sight, but in the mean time see if u can find the lamp current and voltage on your ballast.

a cdm-t bulb is actually hqi but in a different package and lower wattage, they have a better colour stability, they yeald more light per watt but they also dont last as long, they are more compact too, im getting a cdm-t setup next week well in fact i orderd it 5weeks ago but the company is slow at shipping for some crappy reason so it should be here in a few days, this bulb puts out 13000lm - 14000lm initial life and about 12000 - 11500lm at half life, they last about 6000hrs, are very small mine is 10cm long, the burning arc is just 9mm and are available in single or a double ended socket, the one im getting uses the g12 socket it saves abit more room then a double ended socket, anyway bud ill leave it with u and ill get back to u asap on that ansi code.

Trev

pic below is the cdm-t bulb im getting and is 150w, G12 socket
 

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Voltage Output and Amperage

Is the difference between double and single ended bulb setups mainly the amount of space they take up? I'm not quite sure how to determine voltage output and amperage. Is it "120/277 Volt" and "AVG. Watts - 290"?

The info provided for the ballast is as follows:

SUPER HIGH QUALITY 120/277 Volt HID Lamp Ballast.
*************************************************
For 1-250 watt M58 Metal Halide Lamp or H37 Mercury Lamp.
Made by Advance of Copper Lighting.
Catolog# 72C5782-NP.
Lamp Type - MH.
Lamp Watt - 250.
ANSI CODE - M58.
Freg. - 60.
Circuit - CWA.
Core & Coil Figure - F3.
AVG. Watts - 290.
Ballast Type - Dual.

There are detailed photos of the labeling of my ballast at the link below. I know I'm in over my head here and I really appreciate your help Ace:att'n:

M58 Ballast
 
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