Here is my understanding of the FCC beam-mounted lighting.
From the chancel, the beam across the back of the sanctuary has 8 light fixtures.

From left to right:

• A wash light to illuminate the east section of the chancel
• A spotlight to illuminate the center of the chancel, slightly east
• A wash light to illuminate the center-east section of the chancel
• A spotlight to illuminate the pulpit, it is aimed across the sanctuary
• A spotlight to illuminate the lectern, it is aimed across the sanctuary
• A wash light to illuminate the center-west section of the chancel
• A spotlight to illuminate the center of the chancel, slightly west
• A wash light to illuminate the west section of the chancel

There is a ganged fader for lights 1, 3, 6, 8 "front wash"
There is a ganged fader for lights 4 & 5. "side spots"
There is a ganged fader for lights 2 & 7. "center spots"

The 5 wash lights mounted on the beam above the chancel point downward and are ganged to the fader "back wash"

Learnings in 2017:

This electrical panel is located off the choir room:

08Aug2017:
Replace lamp #1 (wash) (east-most) (575W) with 375W bulb. #HPL375WX/115V
Replace lamp #2 (side-spot) (575W) with 375W bulb.
Replace lamp #5 (center-spot) with 575W bulb.

18Mar2018:
Replace lamps 1, 2, 4 & 5.
Sid cleaned contacts in lamp 5.

07May2018:
Clean contacts in lamps 2, 4 & 5.

03Dec2018:
Replace spotlight bulbs 2, 4 & 5. (lectern side spot & both center spots)
Cleaned contacts that tend to corrode.

15Nov2019:
Replace bulbs 1, 2 & 5. Use a bit of aluminum foil in the contact cavity.

11Dec2019:
Replace bulbs 2 & 6. Use Dremel to scrape contacts. Use a bit of DeOxit spray on Q-tip.