71   General / General Discussion / Re: Distortion Power Factor Inconsistencies?  on: February 06, 2026, 11:28:30 AM 
Started by Multisubject - Last post by Ash
If by PF here you mean the lamp discharge PF, 0.77 looks too low. 0.85..0.9 is normal. Could it have been calculated before with some error there ?

If you mean PF of the entire circuit, that would not appear in the equation at all (the sqrt( voltages ) in the formula already takes care of it). And 0.77 is way too high for a discharge lamp without capacitor

Also, by Zbal do you actually mean Zbal or Xbal, and how did you find it ?
 72   General / General Videos / Re: 400W MH lamp Bursts and Keeps Running!  on: February 06, 2026, 11:18:50 AM 
Started by Multisubject - Last post by Ash
At and after the moment of burst, the existing hot spot is still on the electrodes inside the arctube, not on the external conductors and frame. So the cloud of thermal emission of electrons and consequently path of least Vdrop is between the electrodes in the arctube, and the arc keeps burning there

The pressure in the arctube must have been extreme, if even after the gas volume expands to the whole outer (and pressure drops accordingly) it still keeps a high intensity discharge. This probably would not happen if running on the correct gear
 73   Lamps / Modern / Re: Does Transporting BT-shaped Mercury Lamps Cause Looseness?  on: February 06, 2026, 08:59:50 AM 
Started by Maxim - Last post by Maxim
@James — I see. I believe that is what happened with two of my lamps; they somewhat "slipped" out of place, making their rattling more pronounced. But no permanent deformation.

Is there any way to make the frame "slip" its way back in place? Thanks for your reply!
 74   Lamps / Modern / Re: Does Transporting BT-shaped Mercury Lamps Cause Looseness?  on: February 06, 2026, 06:53:08 AM 
Started by Maxim - Last post by James
Normally not.  The support frames are usually made of nickel with 2-3% manganese addition, to pin the nickel grain boundaries.  This gives the material surprisingly good elasticity.  Of course if you apply sufficient force to take the metal beyond its yield point then a permanent deformation could happen.  Also in case of shocks while hot thar can happen more easily.  But I would not be too concerned about transport by car.

What could happen is that the quartz arc tube becomes a bit looser in its metal clamps to the frame.  The quartz pinches are often a bit irregular in shape, and the metal straps do not always clamp them at their widest points.  Small movements may cause the arc tube to slip between its supports, and if it is thinner at that point it may then rattle more.
 75   General / Off-Topic / Re: Incapacitating a microwave directed energy weapon  on: February 06, 2026, 01:36:02 AM 
Started by lightsofpahrump - Last post by Laurens
I don't think an offensive strategy here is wise. Defence is key here.

You can completely forget trying to disable the computers. Just beaming radio waves at it won't work because modern *professional* electronics are usually well shielded. Especially stuff that literally is sending out radio waves. Look at what people are doing with tesla coils. Those things create MASSIVE field strenghts of RF energy (they are literally based on the technology of 1900s era radio transmitters/spark gap transmitters), yet people's cameras are still running just fine, and midi control boards for musical tesla coils are only occasionally glitching out.

An EMP will take a capacitor bank mounted to a box truck with an enormous coil to induce currents in that machine. Unrealistic, *properly* weapons grade (as in 'you are now not a civillian anymore but you're using military scale power against the government) and there's no way to validate its effect against the devices you want to put out of service until you actually have access to one of those and a plot of aussie outback where you can do those tests. You cannot do those tests without being noticed by the authorities, because the EMPs will propagate like easy to receive radiowaves at a distance.

Now, what can you do? Well, that's fairly simple. Buy a roll of super fine stainless steel, thin, flexible fly screen or filter mesh. Make this into full body coverage garments that you wear over a long sleeve shirt and trousers. Ensure all seams are folded over and stitched together firmly so everything makes electrical contact. Connection between shirt and trousers of the garment should overlap generously.

On the condition that the holes in the screen are smaller than the wavelength of the microwave weapons, this will essentially reduce the power your body absorbs by 100-1000x.

As a bonus, this will also protect fully against stun guns/cattle prods (it'll short them out) and diminish the effect of tazers (the darts will still stick into your skin, but part of the energy will be conducted through the mesh. This does come at the risk of sparking on the skin causing small burns, but that is preferable over being shocked and incapacitated).

Of course i have not validated the effect of protective clothing like this. I am a ham radio operator but generating legal limit power at the frequencies used by those weapons (many GHz) is really hard. And tbh, i'd be scared shitless if i were to concentrate that amount of power on part of my own body, even with a suit that theoretically should protect against it.

It's something i've been thinking about since the rise of authoritarian politics both in my own country and abroad. I actually have a roll of copper plated textile mesh sitting around i bought on Aliexpress and it is indeed actually properly conductive, so plated textiles may also be doable. But i don't know how durable the plating is, whether it won't just wear off after a few hours of wearing, and how much power it can dissipate or reflect before flashing off.
 76   General / General Discussion / Re: Why do cars not have cornering lamps?  on: February 05, 2026, 10:20:46 PM 
Started by Cole D. - Last post by Econolite03
This is very common with most Jeeps, including the newest generations—regardless of the model. I don’t think Lexus is capable unless it was added on, never heard of it.
 77   Advertisements / Wanted / Re: How Do I Go About Getting F96PG17 Fluorescent Tubes?  on: February 05, 2026, 09:32:58 PM 
Started by Burrito - Last post by Burrito
Honestly same cause they're huge bulbs.
 78   General / General Discussion / Re: Why do cars not have cornering lamps?  on: February 05, 2026, 09:05:38 PM 
Started by Cole D. - Last post by wide-lite 1000
 They're still on new cars . I just recently saw them on an SUV , Lexus I think . I've also noticed that Dodge in particular is operating the respective fog light in the direction of a turn .
 79   Advertisements / Wanted / Re: How Do I Go About Getting F96PG17 Fluorescent Tubes?  on: February 05, 2026, 09:01:13 PM 
Started by Burrito - Last post by wide-lite 1000
 I'd be scared to death about shipping these !
 80   Lamps / Vintage & Antique / Re: Telam Reflector Mercury Lamp  on: February 05, 2026, 06:31:27 PM 
Started by Oprawy Uliczne - Last post by Oprawy Uliczne
Thanks for your interest and I'm glad you like the channel, I've been creating it for a few years now and recording some of the more interesting things in my collection and beyond .These lamps are some of the most interesting and rarest in my collection. :mv: :mv: :mv:
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