1   General / Off-Topic / Re: Being here gives me extreme social anxiety  on: Today at 10:59:41 AM 
Started by Silverliner - Last post by rjluna2
If I were you, I would stay away from Twitter and tik-tok since they are addictive media material :eoled:

It is a good thing that I'm not in the facebook, twitter, and other media platforms there saving for this lighting gallery and Internet Movie Car Database sites.
 2   General / Off-Topic / Re: What did you do today NOT lighting wise  on: Today at 07:38:08 AM 
Started by Bulbman256 - Last post by LightsAreBright27
Remember how random kids ask if your pphone has games at family reunions? Well i was a victm with my drawing tablet. Some kid cracked the front glass so bad, it made a hole where water slipped in and ruined the display. Lesson learned.
(sorry for spelling error, im typing on my pibook with a microscopic keyboard)
 3   Lamps / Vintage & Antique / Re: Sylvania Clearbanders in colors other than /DX ?  on: Today at 07:09:57 AM 
Started by wide-lite 1000 - Last post by WorldwideHIDCollectorUSA
Nope. Only DX mercs and coated HPS lamps were clearbanded. C and W and coated MH lamps were cleartopped until the early 1980s or so. The N was fully coated in the late 1970s.

I also have a Sylvania MS400/C/HOR probe start metal halide lamp that is definitely a cleartopper in my collection.
 4   Lamps / Vintage & Antique / 1000W M47 probe start metal halide ballast cap value to run 425W H40-17 MV lamps  on: Today at 06:58:07 AM 
Started by WorldwideHIDCollectorUSA - Last post by WorldwideHIDCollectorUSA
After reading about some collectors attempting to run 700W H35 mercury vapor lamps on 1000W M47 probe start metal halide CWA ballasts by derating the series capacitor value from 24 microfarads down to 18.5 microfarads with relatively good results, I am interested in trying to find an appropriate capacitor value that is appropriate for running the rare 425W H40-17 mercury vapor lamps on 1000W M47 probe start metal halide CWA ballasts.

For reference, the 425W H40-17 mercury vapor lamps have an arc voltage drop of about 265V and an operating current of about 1.7A and is NOT interchangeable with 400W H33 mercury vapor lamps; the 700W H35 mercury vapor lamps have an arc voltage drop of 265V and an operating current of 2.8A; and lastly, the 1000W H36 mercury vapor lamps and 1000W M47 probe start metal halide lamps have an arc voltage drop of 265V and an operating current of 4.0A. So far, my initial guess is a capacitor value somewhere around 10 to 12 microfarads for the 425W H40-17 lamp if I am not mistaken. I am interested in answering this question because I am looking for easy ways to help collectors safely run 425W H40-17 mercury vapor lamps just in case they find any in the future, but they are extremely hard to find as they appear to have only been produced during the 1960s and would like them to make sure that those lamps would run properly.

The source that I used to find the electrical characteristics of the 425W H40-17 mercury vapor lamps can be found on the link below on page 15 of the following document:

https://www.scribd.com/document/394833080/Westinghouse-Mercury-Lamp-Brochure-1961
 5   General / General Discussion / Re: My Metal Halides Have Been Flashy Today  on: Today at 06:22:59 AM 
Started by suzukir122 - Last post by sol
I've noticed it is quite random. Sometimes, there is lots, and sometimes there is none. I have lamps that flash a lot and some that almost never flash. Sometimes the flashes are long and intense, other times they are brief and not too bright. I've even had some flash after running for a few hours (although less intense).

When I was in high school, the 400W halides in the gym would each flash once. They would warm up to the clear mercury phase, stay like that for a little bit, and then have a single, intense, bright pink flash that lasted about 1-2 seconds before fading. When it did fade, the lamp acquired its normal colour (sort of like a signal to the end of the warmup period).

Strangely, I have noticed, like suzukir122, that when one lamp flashes, it seems like the others do as well. Like they all flash or none flash. I also noticed it with preheat fluorescent that are all on the same switch. Sometimes they are blink-happy and sometimes they barely flash, but it seems like all the lamps on the circuit do the same at the same point in time.
 6   Lanterns/Fixtures / Modern / Re: Why do so many people dislike 3000K halophosphate warm white fluorescent lamps?  on: Today at 03:43:02 AM 
Started by WorldwideHIDCollectorUSA - Last post by Laurens
Never. I filtered through lots of CFLs at the thrift shops here, spectroscope in one hand and a mini tesla coil in the other, but i've never encountered any halophosphate CFL.
 7   Lanterns/Fixtures / Modern / Re: Does Preheat Ballast Use More Electricity?  on: Today at 03:36:18 AM 
Started by axel_chai - Last post by Laurens
The discussion about power factor and the 'capacitive' load of LEDs brings up a point. Many years ago, I recall it being speculated on here that the proliferation of CFLs and their less-than-high power factor would cause a noticeable strain on the grid. Has this been absolved in the age of LED?
LEDs make the situation better, because they're such small consumers. For extremely small power consumption levels - think phone charger, LED lamp - there are no demands for power factor, at least not in the EU.
For bigger power consumers like PCs, you'll often find the words 'Active PFC' on the box of the power supply. One basic desktop PC draws as much power as 10 LED lamps of >1000 lumen. One gaming PC as much as 50 LED lamps. So therefore, it's much easier and more affordable to focus on those devices that really make an impact.

Nicer LED bulbs have a power factor correction circuit despite not needing one per law. There are driver chips that do it automatically. Big Clive has reviewed a couple of those.

In the past, capacitive loading of the grid has never been an issue. Inductive loads have been much more important to compensate. Our inductive street lighting ballasts are supposed to come with a compensation capacitor, and professional power users with giant motors also have to have giant banks of capacitors to compensate. So if individuals would use CFLs, it would only be beneficial because fewer of those expensive capacitor banks would be needed.
If there would be an excess of capacitive load on the grid today, the operator can just say 'Hey company, i see you have a big 500kW motor. Usually we demand you compensate that for 100%, but because of local grid conditions, we would like you to only compensate it for 50%'.
 8   General / Off-Topic / Re: Interactive Radar Glitch?  on: Today at 01:27:27 AM 
Started by suzukir122 - Last post by Richmond2000
the news outlets will also get priority routing to the weather service and like posted above the site will have load balancing and parallel content servers likely under heavy traffic the content servers are NOT all up to date and getting updated slowly and that causes "jerking" / stutters
 9   General / Off-Topic / Re: 1990s Television Sets  on: Today at 01:23:37 AM 
Started by Cole D. - Last post by Richmond2000
@RRK
Quote
No Sony Trinitrons mentioned?
Sony Trinitrons were one of the best tallies but we never had any in our shop other then the one we owned our self so cant talk to the build quaity except OLD SONY electrical gear was top notch and newer less so (around 2000)
 10   General / General Discussion / Re: Severely leaning Westinghouse OV-50's  on: Today at 01:11:04 AM 
Started by Burrito - Last post by Richmond2000
look at it "wrong" and you get 3 OV-50s
that is the worst lean I have ever seen but out my way the ground is all big so a pole with that lean is going the rest of the way the moment it got bumped
to me looks like the office doors to a mall over a "big box" type store
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