Will be installing 5 parking lot lights at a church parking lot. The City requires 24" deep, PVC ok. The Lights are 120 volt probably High Pressure Sodium 400 watt. Just wondering how many circuits to run for the 5 lights with the transformer draw in there too. I believe they boost the voltage and frequency up on those lights. Correct?

I'd run (3) circuits out there.
(2) for the lights and (1) for the 120V load that they forgot to tell me about.
Remember to run a ground wire to the lights (in addition to any ground rod you have).

aldav53,

I can offer suggestions which might be considered, but since there are quite a few possibilities, the details would be astronomical.

So, here is something basic and simple:

Typically, the total Line VA for most High Power Factor HIDs in the 400 Watt HPS line would be 480 VA.
At 120VAC, this equates to 4.0 Amps per Luminaire (Ballast + Lamp total package draw).

The commonly used Ballast configuration for the 400 Watt HPS - and the 400 Watt MH too, is the CWA (Constant Wattage Autotransformer).

These Ballasts are able to tolerate +/- 10% Voltage Variations, with about 5% Lamp output variations.
Beyond the 10% input variations, Lamp regulation begins to suffer dramatically, so Voltage Drop is an issue to consider first and foremost.

Many CWA Ballasts are the "Quadri-Volt" types, which have input Voltage taps for:
*120VAC,
*208VAC,
*240VAC,
and
*277VAC.

If the Lighting is to be controlled by multi-pole Lighting Contactors, consider using L-L Voltage for the Fixtures, across different Circuits.

Example:

Two - 20 Amp, 2 Pole Circuits from Panelboard.
3 Fixtures on one 2 Pole Circuit,
Remaining 2 Fixtures on the other 2 Pole Circuit.
#10 THHN cu. to first Pole for each 2 Pole Circuit.

If 120VAC is a non-negotiable thing, then break up fixtures across at least 3 Circuits, using no smaller than #10 cu. - unless the fixtures are so close, there will be no Voltage Drop issues.

Good luck.

Scott35

2 lights per 20 amp circuit sounds good, with the # 10 wire.