Check your equation. Decreasing the power factor must increase the current, ie. when calculating the current you must divide by the power factor, not multiply by it



Also, the formula with Zbal is a bit abridged, but that has smaller effect on the precision of the outcome

Z = sqrt( X^2 + R^2 ), where X is the inductive impedance, R is the resistance representing the losses (most of it is plain DC resistance of the winding wire, but there is some more to account for the core)

So the ballast itself does have its own angle between Z and X, which depends on the ballast efficiency, and does not have anything to do with the lamp PF or the complete circuit PF

When calculating, the Vdrop of the ballast consists of Vdrop(X) and Vdrop(R), which together form Vdrop(Z). However, Vdrop(R) is the one which is mostly in phase with the Vdrop of the lamp arc

So, the complete Vdrop sum would be something like :

Vline = sqrt( Vdrop(X)^2 + ( Vdrop(R) + Varc )^2 )

I'm sure very few of you have heard of Jet-Phillips lol. Anyways, I was wondering if I could have some help in my search to find any information about Jet-Phillips. I know their original headquarters and that they made the infamous "Houstonian" 2x2 shoebox canopy light. Is there any more information that can be dug up about them?

Their headquarters: https://www.google.com/maps/@29.7625477,-95.31146,3a,47.7y,344.26h,94.25t/data=!3m7!1e1!3m5!1s95n2bDuWtEMDjMIojMuuEA!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fcb_client%3Dmaps_sv.tactile%26w%3D900%26h%3D600%26pitch%3D-4.246738559057675%26panoid%3D95n2bDuWtEMDjMIojMuuEA%26yaw%3D344.2600707370192!7i16384!8i8192?authuser=0&entry=ttu&g_ep=EgoyMDI2MDIwMy4wIKXMDSoKLDEwMDc5MjA3M0gBUAM%3D

I'd love to hear your thoughts. I'd especially appreciate it if we can dig up any of their catalogs or something. Thank you!!!

I know, I know, another annoying question about calculations... 

Last time we talked about this, I mentioned this equation that was devised:
ILamp = (PF * √(VOC^2 - VLamp^2)) / ZBal
Where ILamp is RMS lamp current, PF is distortion power factor, VOC is supply voltage, VLamp is RMS lamp voltage, and ZBal is ballast impedance. I use this equation to determine the power factor:
PF = PLamp / (VLamp * ILamp)
Where PLamp is wattage. This is the definition of power factor, is it not? I am pretty sure it is. But something doesn't quite check out here. Here is an example, I am using 35W S68 North American HPS, but this same phenomena happens to most other lamps:
PF = 35 / (55 * .83)
PF = 0.77
Cool. So the distortion power factor is 0.77. So let's plug it in and see if we can get the right lamp current with all the other specs being known:
ILamp = (0.77 * √(120^2 - 55^2)) / 116.5
ILamp = .7A
So the current is .7A. But no, that is false, it is supposed to be .83A, that is an error of over 15%. I think the power factor is the problem. A while back I calculated average power factors for different technologies (hps, mv, etc) using the more complex of the two equations (not the definition of power factor, the other one). Let's try my calculated HPS average power factor of 0.913. Keep in mind that this value is averaged from across all HPS lamps of which I have specs.
ILamp = (0.913 * √(120^2 - 55^2)) / 116.5
ILamp = .84A
Well I'll be darned! That new magical PF value gave a result that is within 2% of the actual value. Very nice!

So power factor is the problem. Either the way I am calculating PF is wrong, or the way I am using PF in the big equation is wrong. Which one is it? And thank you all for your continued mathematical help, I think we are on to something here.

That does look promising. Really hope it goes through and incandescent and triphosphor F40T12 fluorescent bulbs end up becoming unbanned.

Yes, I currently don't have an antivirus, I just didn't want to explain all that.

It seems like today most people's gut reflex is that the second an OS falls out of support it will be all full of trojans and malware and won't be safe to use anymore. In reality, out of support OSes quickly lose market share and thus become a less-desirable target for hackers. Most programs won't even run on W7 and XP anymore!

Actually, the "the second an OS falls out of support" is fairly correct for Windows, and will become more and more correct for each newer Windows version that is dropped out of support. XP may not be as bad / become bad as quickly as 10 or 11 when each of them becomes unsupported, but it is bad enough to expect it to be hijacked at some point if it remains connected to unrestricted internet

The market share may be declining, but you can't deny that the remaining share is "delicious", and only becomes better with age like old wine. Consider who it may consist of :

 - Home users with zero information protection skills or capabilities, which become easy targets for credit card thefts and plain scamming

 - Businesses which also fail in all other information protection duties like backups and securing their systems and become easy targets for ransomware attacks

 - Unattended systems which are an easy free proxy for performing attacks on other (not necessarily unsupported) systems

Finally, maybe new threats to the system are becoming less common, but this does not mean that all the threats already existing (and from which the system is not getting protected anymore) disappear from all over the internet overnight...

The arctube sees the conductive ITO layer inside the lamp, not the wire directly. The ITO is coupled to the wire by capacitance, ie. it is coupled for AC (including the pulse) but not for DC

The wire will be at the same potential as the L cathode of the lamp (except the ignition pulse). So AC voltage of 0 between this cathode and the ITO, and AC voltage of the full lamp arc voltage (some 120V) between the Neutral cathode and ITO

The ITO may be charged by DC from any effects already taking place within the lamp. I do recall reading something about it here (James ?). The AC coupling would at one half cycle add and in the other half cycle subtract from DC effects, the overall effect would be either zero (expectations...) or maybe something else depending on the mechanism of some quirky effect

Finally, at any moment the ITO will either attract or repel Sodium ions, depending on the polarity of the momentary voltage (sum of DC + this moment in the AC) between it and the region in the arctube from which the sodium would be drawn. The DC voltage (and how it compares to the peak of the AC) will determine if the sodium would be repelled all the time (best case), attracted all the time (worst case), or attracted and repelled alternatingly throughout the cycle

I do recall reading here about a failure mechanism in SOX lamps, where the getter flashing was a bit out of size and place, and shorted one of the main terminals (where they come out of the stem) to the ITO, which have led to fast destruction of the lamp. In this case, there is no capacitive coupling to the ITO, and no DC effects can take place. It would be at hard 120VAC relative to the other (not shorted) terminal, so half the time pulling sodium out and half of the time repelling it (which does not undo the damage from the 1st half)

That Ebay one looks like a good deal.

Here is the other website: https://lightbulbdepot.com/products/details/?item=00966A

I will warn you, shipping for these is going to be a king's ransom!

Same here browsing on xp. I found two hp compaq 6710b laptops, mid to high end business laptops from the beginning of 2006. They could run windows 7, but I installed xp one one of them (didn't have enough ram to upgrade). On the laptop with windows xp, I installed supermium (chromium based browser) and browsed lg. Surprisingly the battery still works on both.
Specs: intel core 2 duo t8300, 512mb ram (win xp) and 2.5gb ram (win 7), 128gb ssd

If you have a windows xp computer, use legacy updates to get all the updates till 2014.

Around 2019, I also visited lg using an old hackintosh laptop (mac os on windows laptop). It was a hp probook 4510s with a core 2 duo. For a hackintosh, intel cpu, intel integrated graphics, and a broadcom wifi card are crucial. So I just swapped the intel wifi card with a broadcom one, and browsed lg using mac os 10.6 snow leopard.
Specs: core 2 duo p8700, 4gb ddr3, 128gb ssd.

With hackintosh drivers, I got wifi, sound, and even the camera working. Unfortunately couldn't find drivers for sd card reader and lan.

Yeah but I'm mostly trying to go after just 2 or 4

I have heard of a website that sells them, I forget the name of it but I am sure someone will chime in. Also ebay:

https://www.ebay.com/itm/267526760251