91   General / General Discussion / Re: What did you do today lighting wise?  on: April 05, 2024, 03:40:44 PM 
Started by RyanF40T12 - Last post by Laurens
https://nl.aliexpress.com/item/32761452139.html

Ordered a pair of these SB "fluorescent" lamps. I wonder what i'll get when they arrive!

These just arrived. They are stamped in chinese 'Minghua Yaming Ballasted Fluorescent Mercury' and HY-GYZ-125w.

One of them looks in good shape, the other one has an impact mark in the inner coating of the balloon, from the filament holders impacting it. This is because the whole filament/arc tube assembly is melted into the balloon at a slight angle, compounded with some shocks it has received in transit. Do not expect any semblance of quality control with these things. Price-quality wise it's fine, for less than 30 euro including shipping from the other side of the globe, and in a fairly short time, i'm not complaining about that. Things would be different if i were to buy one locally, from a well known brand.

The packaging was excellent. Sturdy double corrugated box with thick layers of bubble wrap around the lamps, which are shipped without their boxes. Probably for the better, as they would likely be able to rattle around in those boxes.

I was already trying to figure out what the coating is exactly. It appears the same as the coating in my recently bought halophosphate 530 lamps spectrum wise. But the color's different and i just haven't figured it out yet. The 530s i bougth are also very different from what i'm used to, spectrum wise. Color wise they're similar to my older lamps. I had already written down a bunch, and then decided it warrants its own forum or gallery thread with spectrum pictures and such. Not gonna do it right now, too late at night for that.

Who knew that in such mundane things as light bulbs, there is so much to discover.
 92   Lamps / Modern / Re: The first LED retrofit lamp you saw in your life?  on: April 05, 2024, 01:19:17 PM 
Started by Flurofan96 - Last post by arcblue
Indeed, the first LED retrofit lamp I saw in use were the tubular exit sign ones with 5mm red or green LEDs. The oldest LED retrofit lamp I have personally dates to the early 90s I think - it's a 12V MR16 bipin base and uses a cluster of 5mm red LEDs. In the early 2000s I bought some early Lights of America PAR30 CFLs that used 6500K 5mm LEDs. It looks like a showerhead. One has been in nightly use for 14 years now on a timer, so it's surpassed the 30,000 mark and all diodes are still working, just very dim and yellowed out. I also bought some early A19 LEDs of various styles and one of the heavy metal case R20 GE LED spotlights around the same time, and some early SMD low-voltage flashlight and landscape bulb retrofits that put out barely any usable light. Maybe the absolute worst I remember were the plastic base "Meridian" C7 nightlight retrofit LEDs that used a single 5mm LED. They were just about useless in terms of light and failed by literally burning up...not a good design.
 93   Lamps / Modern / Re: HE vs HO fluorescent lamps  on: April 05, 2024, 01:08:02 PM 
Started by marcin110 - Last post by arcblue
Like xmaslightguy, I have run 54w HO lamps (nominal 4 foot) on 28W HE ballasts. In this case, the ballast was electronic program-start type, so cathodes are preheated during startup, but I'm not sure that they remain heated during operation; my guess is they don't. I found I got reasonable lamp life (maybe 5 years or so? I can't remember but it was used a lot) nonetheless, and the ballast didn't seem to get hot or have any issues. Running the HO lamp at much lower current didn't double its life, though.

I'd not advise the other way around (HE on an HO ballast) as the lamp isn't designed for higher current and would likely suffer significantly shorter life.

Oh, I'm also running some Powergroove VHO lamps (1600mA) on an HO (800mA) ballast and so far they are doing fine as well. I have some defective lamps that will blow out (slowly lose vacuum and die) on their proper ballast at 1600mA but they seem to survive when run on lower current. I believe these ballasts have continuous cathode heating though unlike the T5s.
 94   Lanterns/Fixtures / Modern / Re: American Electric 125 400w HPS Ignitor Wiring  on: April 05, 2024, 01:03:20 PM 
Started by Metal Halide Boy - Last post by Metal Halide Boy
More pictures.
 95   Lanterns/Fixtures / Modern / American Electric 125 400w HPS Ignitor Wiring  on: April 05, 2024, 01:00:34 PM 
Started by Metal Halide Boy - Last post by Metal Halide Boy
I got an AEL 125 recently. It has a 400w HPS quad-tap ballast. Anyway somebody took the ignitor out. I found a ignitor that I beleive to be the factory-correct part, but I'm not sure where each wire goes. It has three terminals, each with 2 spades so you can hook 2 wires to each terminal.  It looks like there are 2 black wires that go to 1 terminal, 2 white wires to another terminal, and 1 red wire to the third. Just my guess. I got the ignitor in a box with some other ignitors, and there was also this plastic insulating piece in the box. Do you think it goes with this ignitor?
 96   Lamps / Modern / Re: Have halophosphate fluorescent lamps ever been linked to office fatigue?  on: April 05, 2024, 12:50:17 PM 
Started by WorldwideHIDCollectorUSA - Last post by arcblue
I suspect lighting uniformity, lighting levels, contrast, glare and many other factors that are not lighting-related would have had a greater effect on office work-related fatigue than lamp CRI. I worked in offices for most of my life, so much time was spent under typical office fluorescent lighting.

When I was growing up, the halophosphate F40T12/CW (and occasionally /WW) lamp was in offices and schools. Only when there was a color-intensive task did CRI make a difference. In most black & white paper-related tasks, this wouldn't make a difference. If the lighting was such that the black & white contrast was reduced, that could be an issue. If computers were used, they were often at the time monochrome (usually green on black) CRTs so glare on the screen could be an issue, but perhaps less so than with color monitors where the print was black on a white background. I remember people putting glare guards on their color CRTs in some spaces. Later flat screen LCD/LED monitors often had more of a matte coating and didn't reflect as badly.

Some offices and schools back in the day even had the Lite White 34W lamps which had an even lower color rendering than cool white. I never could tell back then that there was a difference.

I do remember the switch from F40T12 magnetic to F32T8/triphosphor electronic in offices. This eliminated the flicker of magnetic ballasts (which never bothered me, but bothered some people) but many people still hated them. I hated the F32s more because they had higher surface brightness (more glary) and they often chose a 3500K color temperature for some reason in offices rather than SP41s. I know in one office, people complained about the brightness after a group relamp so the "compensation" was for the maintenance man to remove the inner two lamps from each fixture. It looked awful. A common retrofit elsewhere was to replace four lamps with two and add a specular reflector to the troffer. This only looked OK if the sockets were also moved closer to the center of the troffer.

I think about those who worked in factories that had HPS high bays, or even mercury vapor high bays. With very low CRI and very tinted light, one's eyes do adapt to it (and then other lighting or daylight looks strange). Inadequate light, noticeable flicker or glare though, definitely leads to eyestrain and headaches.

In my "home office" the lighting is probably not ideal, but I use 5000K 90CRI F40s on a magnetic ballast during the daytime, with a 13w 5000K PL desk lamp if I need supplemental lighting. I have an accent light and a desk light with 2700K triphosphor CFLs for after dark/later night computing (I turn off the overheads), with some low-wattage linear fluorescent 5000K in back of the monitor and under the monitor shelf (lighting the keyboard) for indirect lighting. I also have a torchiere with a SBMV (3200K or so) if I need the room brighter. No light shines directly in my eyes anywhere and no LEDs, LOL. I used CRTs up until about 10 years ago then went to CCFL-backlit flat screens.
 97   General / Off-Topic / Re: 1990s Television Sets  on: April 05, 2024, 12:39:12 PM 
Started by Cole D. - Last post by RRK
In fact, 'American method' ) was not the best at the time of color TV adoption in USSR (Wikipedia says 1967) and German PAL system already was the clear winner. But it was rejected in part because of political reasons, and in part because of Soviet industry unwillingness to include a precision 64 microsecond delay line and a precision 4.43 MHz crystal in each TV set. SECAM uses a delay line too, but it can be a couple of orders less precise.

 98   General / Off-Topic / Re: 1990s Television Sets  on: April 05, 2024, 09:59:09 AM 
Started by Cole D. - Last post by Medved
Those idiots followed some French invented idiocy on adopting it...

 "Something Exceedingly Contrary to the American Method"

I think it is quite matching the sentiment there...  :lol:
 99   General / General Discussion / Re: What did you do today lighting wise?  on: April 05, 2024, 08:49:18 AM 
Started by RyanF40T12 - Last post by Laurens
Checked out the fluorescent lamp aisle of the diy store again. It's finally happening - their final stock is in the store. Only Philips 18w 830 and 840 fluorescents left (for €1,60 a piece!) and a bunch of Sylvania Circline stuff which is allowed to remain in production a year longer. Possibly because our national railways use circline lamps in their station clocks, but idk.
 100   General / Off-Topic / Re: What did you do today NOT lighting wise  on: April 05, 2024, 08:03:12 AM 
Started by Bulbman256 - Last post by LightsAreBright27
Today I found a stack of insulators. Sadly only was able to take a few because of their weight. The small one is like a cup, but probably dangerous to drink from it.
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