On 9/22/19 2:42 PM, KenW wrote:
On Sun, 22 Sep 2019 14:30:42 -0400, Larz
wrote:

I recently installed a mercury vapor light fixture. It is a 125 W lamp
with integrated ballast in the housing. Today, I check the current with
a clamp ammeter on the 120 VAC/ 60 Hz line going into the housing.
After a 10 minute warm up, the current reads approximately 2.3 A AC.
Not being sure, I then wired a series multimeter in line for a moment
and it too read 2.3 A. Unfortunately, there is no PFC with this yard
light, only the bulb and ballast, so I don't think anything can be done.
However....

In another set up I have on the way, there is the 175 W MV bulb, ballast
and the PFC capacitor that will be used with the ballast. Any ideas as
to performance would be welcome. I'm just looking for in general as I
realize we can't get too specific without any more figures, but I'm
really hoping the efficiency is better than with the 125 W set up.

Thank you in advance.

Since I have no idea about them I searched for PFC capacitor
and there is plenty of information about them which my help you.


KenW


I was just hoping to cut to the chase with someone using the examples
above. I'm not all that pleased with the lack of efficiency with the
125 W lamp, just wondering if the capacitor would increase efficiency
with the 175 W set up.

At one time, 25+ years ago, in college, we actually had to calculate the
correct capacitor to use in a circuit for PFC, but that's the last time
I did it.