1   General / General Discussion / Re: What did you do today lighting wise?  on: Today at 12:22:06 AM 
Started by RyanF40T12 - Last post by RyanF40T12
Changed out a bad T8 ballast. 
 2   General / General Discussion / Re: Your dreams about lighting...  on: April 13, 2024, 09:17:32 PM 
Started by Foxtronix - Last post by rlshieldjr
Many I can't remember all of them. One was I was somehow tasked with fixing a series streetlighting system that utility and the city crew couldn't get working. It was overhead wired OV50 mercury vapor. I found the problem was the 2 circuits were miss wire from the regulators to the disconnect box.  Part of the dream was a woman I know said "Hey Rick are you going to get my lights fixed" I told her about the dream and she had a good laugh about it.
 3   General / General Discussion / Re: What did you do today lighting wise?  on: April 13, 2024, 09:09:12 PM 
Started by RyanF40T12 - Last post by rlshieldjr
Went to the Riverside ReStore with Dave and met fluorescentlover40. Got a few bargains as bulbs were 75% off.
 4   General / General Discussion / Re: What did you do today lighting wise?  on: April 13, 2024, 06:33:58 PM 
Started by RyanF40T12 - Last post by Caroline
Planning to finish my H4 desk lamp, right now it's working but it's missing the soft starter and step-down components so the bulbs are getting all of the 12V instead of the 10 (high) and 7 (low) I'd like. They're made to burn out in ~500 hours and you can tell because of how bright and hot they run, I'm not in a car so I don't need that much brightness to spot deers crossing the road ^^
 5   General / General Discussion / Re: Bulbs with a hole in the base  on: April 13, 2024, 06:25:23 PM 
Started by Caroline - Last post by Caroline
Great info. First time I read it, I'll bookmark the site to browse a bit more later on :bulbman:
 6   General / General Discussion / Re: Your dreams about lighting...  on: April 13, 2024, 06:00:39 PM 
Started by Foxtronix - Last post by WorldwideHIDCollectorUSA
Just had a dream where I spotted a multi story high school building resembling a skyscraper with many 4 lamp F40T12 preheat halfpiper fixtures all over the place with many even installed outside. Many of the outdoor halfpiper fixtures were stem mounted while the halfpiper fixtures that were visible indoors from windows were all flush mounted. Some of the outdoor halfpiper fixtures were installed on a canopy over the main building entrance while other outdoor halfpiper fixtures were installed in outdoor corridors. The outdoor halfpiper fixtures had a mix of blackender and brassender F40 tubes installed. The indoor halfpipers were turned on while the outdoor halfpipers were off. Later on in that dream, I caught the building undergoing renovations and saw a large number of the halfpipers laying on the ground underneath the main entrance canopy with tubes and PCB-laden 2 lamp brick ballasts removed. As the renovations were going on, I loaded roughly 25 stem mounted fixtures onto a flatbed truck along with the removed brick ballasts. I felt a little sad as the dream ended because I sadly did not get the fixtures that I have been rescuing in that dream. Some of the tubes that I salvaged in that dream included a large number of F40WW and F40CW tubes, but sadly, some F34CW tubes were mixed in.
 7   Lamps / Modern / Re: Metal halide questions...  on: April 13, 2024, 01:05:28 PM 
Started by Multisubject - Last post by LightBulbFun
The white coating on both ends is typically universal burning . Here in the U.S. A base up only lamp has the coating only on the base end while on a base down only version it's only on the crown end of the arc-tube .

I think you have that inverted, a position redistricted metal halide lamp will *generally* (but not always looking at you GE Halarc!) have its white coated arc tube end at the lowest point in the lamp



for example note in the Lamp from Max that I Linked to,

https://www.lighting-gallery.net/gallery/displayimage.php?pos=-154383

its burning position is base up only, and notice how the white part of the arc tube is in the crown end of the lamp, as when the lamp is base up that is the lowest point in the lamp


and conversely on this base down burning lamp https://www.lighting-gallery.net/gallery/displayimage.php?pos=-230971

note how the white part of the arc tube is now near the base of the lamp since when burning base down, that is the lowest point of the arc tube



the whole point of the coating is to raise the temperature of the coldest part of the arc tube and ensure thermal uniformity of the arc tube for most optimal performance, and to simplify it, as most of us know heat rises, so thus the lowest part of the arc tube is what needs the most insulation




also with regards to the first line, certain lamps for horizontal burning only will still have heat reflective coatings on both ends of the arc tube, just something to be aware of


so the heat reflective coatings of a metal halide arc tube, can give you a good hint as to the burning position of the lamp, but one should still be on their toes about it if that makes sense
 8   Lamps / Modern / Re: Metal halide questions...  on: April 13, 2024, 11:47:24 AM 
Started by Multisubject - Last post by LightBulbFun
The white coating has nothing to do with burning positions, it's purely a heat reflecting coating to raise the cold spot temperature behind the electrodes. The lamp will almost certainly be universal burning, but without a picture of it, it's not possible to say definitively.

thats very misleading, the white coating, has *everything* to do with the burning position of a metal halide lamp


I recommend giving these uploads by Max a read as to the importance of the white coating, and its influence on the burning position/thermal properties of a metal halide arc tube


https://www.lighting-gallery.net/gallery/displayimage.php?pos=-154383

https://www.lighting-gallery.net/gallery/displayimage.php?pos=-154318



please dont be so misleading to a new member like that who might not know better.




as for the OP, running the lamp for 10 minutes on a CCFL ballast, as RRK says thats fine, 10 minutes I doubt would of likely done it any harm


the ballast capacitor sounds good to me, 24uF is correct, have you double checked the voltage taps on the ballast? a lot of these US ballasts have multiple voltage taps, so I wonder if your perhaps accidentally have it on the 208V or 240V tap or such like?

for example doing a very quick ebay search I see while Venture have Orange as the 120V tap, for "Universal" branded ballasts Orange is 208V, so I would double check




also on the lamp front, have you tried operating it in different positions, or in the brief time it is working, to tap the bulb? does that cause it to go out or such? with this im trying to work if there is a bad contact thats acting like  a bimetallic switch as the lamp warms up :)

 9   Lamps / Modern / Re: I figured some things out since my metal halide question, but...  on: April 13, 2024, 11:40:03 AM 
Started by Multisubject - Last post by Multisubject
I just did some research, and as it turns out, this lamp in fact is a blue/UVA lamp. It is for developing certain types of photos I believe. They are meant to be operated on a normal m-59 CWA ballast, but with a slightly larger capacitor! I just tried it out to make sure and it worked perfectly and didn't cycle. I added a 5 uF motor run capacitor in parallel to the existing capacitor. From what I could find, the wavelength emitted by this lamp is not super harmful, but I am definitely not just going to use it for general illumination applications. From my research, the actual running wattage of this lamp is 500w, but only for short periods of time, just to develop a photo. Their lifespan is not super long either. I could only find 1 reference to this lamp on Lighting-Gallery, so it must be at least a little rare. Thank you so much RRK and Maxim, I wouldn't have figured this out without you.
 :) :mvblb: :bumh:

Thanks!
 10   General / Off-Topic / Re: What did you do today NOT lighting wise  on: April 13, 2024, 09:18:23 AM 
Started by Bulbman256 - Last post by Rommie
I know what you mean, the car I have now is the only automatic I've ever had, so I do find myself looking for a non-existent clutch pedal sometimes..! I also occasionally reach for a gear lever, and as the car is LHD and I'm used to RHD, I bang my hand against the door  :mrg:
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