1   General / General Discussion / Re: Running 400W HPS builb on 250W coil and core ballast  on: Today at 07:10:33 AM 
Started by veso266 - Last post by dor123
The lamp would be underdriven and the ballast would overheat.
 2   General / General Discussion / Re: Zimbabwe’s jail sentences and fines for using and owning banned light bulbs  on: Today at 07:00:03 AM 
Started by WorldwideHIDCollectorUSA - Last post by veso266
wtf, no wonder people don't want to care about enviroment if some other people direct how they will live, what they are allowed to use

Thats not democracy, thats dictatorship, why do people have to care what bulb I use, LED is not all lollipops and sunshines... and I might prefer other lightsources, its not like I will kill milions of people if I use incondecent bulb, people behave like I own a firearm or granade

for what? do we realy help the enviroment for banning tehnology like that

lets ban fire next, its hot, and way more dangerous then a simple lightbulb (thungston wire in a vacum)
 3   General / General Discussion / Running 400W HPS builb on 250W coil and core ballast  on: Today at 06:43:23 AM 
Started by veso266 - Last post by veso266
Hi there, someone gave me a 400W HPS bulb with external igniter: https://www.any-lamp.com/osram-vialox-e40-nav-t-400w-super-4y-4050300281179

and I want to try it if it works

I only have 250W core and coil ballast (the normal non-electronic one also called a choke) with an igniter setup

because this things are big (my floodlight that this is all housed in is big) I cannot just buy a 400W one, because I will run out of space  :) so I have to do with what I have

Now I did read that if u do the other way around (250W bulb on 400W ballast) the bulb might explode, because nothing is limiting the current

But what about 400W bulb, 250W ballast, can I damage my ballast and igniter (I realy don't want to do that, because it took me months to find this (with coil and core ballast) floodlight locally)

Can I also run any other bulbs with my ballast (the guy that gave me the HPS (he also had 400W fixture, but sadly he took out the ballast and left the fixture for gypsies, he didn't know anyone would want that nowadays) also said he has some Mercury Vapor and CHM ones, here is a picture if anyone is curious

Igniter: https://imgur.com/gAqFgTX
Ballast: https://imgur.com/YF42Qop

On ballast it says: Layrton HSI-SAPI 250/23-P and here is its manual: https://fenyaruhaz.hu/dtradeFS/LAYR/INFO/HSI-SAPI_250_23-24.pdf
some other document: https://www.dna.cz/download/ke-stazeni/Layrton/Katalogov%E9%20listy/Tlumivky%20v%FDbojky/02_layrton_sodik_halogenold.pdf

 4   General / Off-Topic / Re: Funny Coworker Stories  on: Today at 04:24:21 AM 
Started by CEB1993 - Last post by Medved
A, a stereotypical Karen. Fun to read about their antics, but everything but fun to meet in person...
Glad my job does not include handling such individuals...
 5   General / Off-Topic / Re: Funny Coworker Stories  on: Today at 01:05:53 AM 
Started by CEB1993 - Last post by suzukir122
Heh... I do NOT want to meet Kathryn. Nope. lol
First major red flag: the moment she started complaining about something as miniscule as leaves in the skimmer.  :lol:
 6   Lamps / Vintage & Antique / Re: Correct inductance of choke for running a 40w T12 on 220-240v mains?  on: July 16, 2024, 11:59:55 PM 
Started by Laurens - Last post by ultralume
RRK, I thank you for your explanation. I multiplied the impedance value of the ballast, 45 Ohms by 0.075 and got 3.4 Ohms. I measured the resistance of the choke and got 3.3 - 3.4 Ohms,
Which agrees with the calculated value..
 7   General / Off-Topic / Re: Funny Coworker Stories  on: July 16, 2024, 11:28:03 PM 
Started by CEB1993 - Last post by Maxim
I don't really have any coworkers of my own where I work, as I lifeguard, but I do have some funny stories to tell to you all nonetheless.

I'll start with one for this evening. So. You all know how there's always that one individual who has to stick their nose into everybody's business? Who tells people how to do there job with a condescending sneer? Well meet Kathryn and her three wild sons. She came onto the pool deck one time, early in the day, with her three kids. They came in with a good three bags of toys (water guns, water balloons, sinking toys, etc., etc.) and four floaties. Immediately it was not a good look; these fellows were coming out of a very spent-looking, beat up, and dingy '12 Chrysler Pacifica. For context typically my managing company typically relays the message to guards to prohibit the use of floaties. I usually don't, but there are times where the authority comes in handy as people love to abuse their privileges.

So this family comes in, sets down their stuff. Nothing out of the ordinary. Then the lady comes up to me and asks me why there're leaves in the skimmer (the suction fittings on pool walls). I tell her that I had just opened pool and that she was the second family on deck and that I'd get to it as soon as I put up the deck umbrellas and skimmed the pool surface. Well, lo and behold, two minutes later she comes over to me and tells me to lower the pool temperature. I think to myself, what??? Lower the pool... temperature??? How? Then her youngest kid starts crying, I tell her that I'm unable to do that, and then she returns to her seat. Then her eldest son (about 13 years old) starts soaking everything and everyone around him, including his mom, the other patron, and me, complaining about something or other that I can't even remember. Then her other kid did a damned backflip off of the "deep" end (5ft), which then led me to blow my whistle and calmly but very angrily tell the lady and her kids to leave. She then tells me that, "I'm not doing my job" and that she'll "call my manager and tell him I'm being lazy and not accommodating" for her and her kids. I tell her that their behavior as a whole is entirely unacceptable and that she's banned from the pool for 1 day. She then proceeds to tell me that I'm "picking on her kids" and not allowing them to "splash around and have fun in a pool."

Anyways, that's my work story of the day. I certainly have more, but that's the only one for now.  :mrg:
 8   General / Off-Topic / Re: Any of you wanted to be an electrician?  on: July 16, 2024, 08:28:39 PM 
Started by Silverliner - Last post by Maxim
Yes, I've certainly had that consideration. I'm still a high schooler (going into the 11th grade), so it's more of a thought than a compulsion, but I've been eyeing careers in the electrical field for a while now. I originally "apprenticed" at a small, local electrical engineering firm. I realized that the job is mind-numbingly boring, and I would quit before the first month if I decided to pursue this career.

Now I've set my sights on mechanical engineering with a specialty in materials (similar to what Joseph125 described, and what James and Max do for a living). I don't really do well in a sit-down environment like a 9-5 office job, and want to pursue something more hands-on, but also something that pays upwards of a 120K a year. I plan to attend university for my Bachelor's, and then eventually my Master's when the time comes.

I've also seriously considered partaking in a trade (ie, lineman) once I have a steady, secure job and the income / time to afford going to trade school on the evenings and weekends. I'd probably work on the weekends as a side hustle, nothing too serious, but I'd definitely be a qualified candidate for an installation-based job as I have an eye for the little details. Who knows though.

Though, within school, I definitely was torn between attending trade school (through my HS, which starts in the 10th grade) and following the normal path to university and beyond, and I'm honestly happy with my choice. I definitely feel like I can do more with my gifts than taking the path of least resistance.
 9   General / Off-Topic / Re: Funny Coworker Stories  on: July 16, 2024, 05:54:53 PM 
Started by CEB1993 - Last post by suzukir122
I just remembered another recent story. Okay, so as some of you know, I own a custom sport car. I drive it to work most times, but not all the time.
My coworkers love it, but there's one coworker that shows me no mercy. Jasmine.
I pulled into the work parking lot with my car as two of my coworkers got out of their SUV... Kenny, and his wife, Jasmine.
They parked their SUV behind the entrance gate. Before I could pass the gate, I heard Kenny say to Jasmine, "You better wait till he passes or he'll run
you over!" "Boy please," Jasmine said, before quickly walking in front of my car... before I could pass. :lol: I slowed down as she continued walking, and
drove slow to her walking speed. The smoking section shed is to my right about 20 feet away. I could see my other coworkers in that shed, laughing.
I pulled in the clutch and revved as she continued walking slowly to the shed. Despite my car being loud, she wasn't phased. She mumbled something just
before entering the shed. Everyone else in the shed looked at me... most of them were smiling. lol
This was all in fun though... all of it. She's a great worker, and she and her husband are both awesome people. I've actually gotten even closer to them
now, since unfortunately Kenny had a heart attack. He survived it, and ever since then, I've found myself joking around with them a lot more often.
 10   General / General Discussion / Re: Why UV LEDs have continuous radiation in the spectrum?  on: July 16, 2024, 04:02:02 PM 
Started by dor123 - Last post by James
The continuum of visible radiation is normal with many UV LEDs, and can be quite a problem.  There are two main causes : fluorescence of the sapphire substrate used for the chips, and presence of impurities in the p-n junction having lower band gap than the high voltage AlInGaN dopants used for UV radiation.

The same parasitic continuum can also be found in blue and other colour LEDs, but to a much lesser extent.  On the one hand, the impurity content tends to be similar but because the forward voltage of visible LEDs is lower than UV LEDs there is less excitation of the impurity traps.  Secondly, the visible LEDs have efficiencies up to about 85% whereas many UV LEDs don’t even reach 5% efficiency.  So the intended radiation with colour LEDs drowns out the tiny traces of parasitic continuum and we hardly see it, but for UV LEDs it can be a substantial amount of the radiant flux.  Thirdly the parasitic radiation tends to cover the visible wavelengths only - and it overlaps the intended radiation with visible LEDs so is much harder to distinguish.  But for UV we cannot see their peak radiation and only observe the parasitic glow.

This can be a commercial problem because customers expect UV LEDs to be either invisible or a pale blue/violet, like traditional lamps.  However, since the parasitic continuum tends to occur in two broad bands peaking in the green and sometimes also in the red, many UV LEDs have an unsightly white hue that is slightly greenish or yellowish.  Customers hate this.  It’s even more of a problem because the parasitic radiation is caused by tiny variations in impurity content which are different from one LED to the next or between batches.  For instance, in UV LED T8 tubes the individual LED spots can all have slightly different colours.  This looks cheap or defective.

UV LED manufacturers have to make extra efforts to control the impurities, which makes them far more expensive than other LEDs.  Or they resort to colour binning and may scrap as much as 50% of the production, keeping only those within a narrow range of colour appearances. 

I had the same problem when developing UV LED filaments some years ago, and now have a patent on a much cheaper solution.  I add a tiny amount of a blue-emitting phosphor which converts about 1% of the invisible UV to a rich blue radiation.  That completely overpowers the parasitic radiation and delivers a nice-looking blue glow.  We can now use 100% of the UV LED chip yield which greatly reduces costs, and there are no extra costs needed for impurity process control or colour binning.  Recently, another trick is to add an intentional dopant to the p-n junction to generate a small amount of blue light.  The result is an LED chip having a dual wavelength emission.  Due to the patent situation though, not all companies are able to offer consistent colour UV LEDs and there are a lot of rather bad looking products.

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