Challenge 246 xmas lights

Pleased I knocked it out pretty quickly, possibly used too many variables but reads OK to me. Side note talking at work about hardest programming languages, I had brainfuck down as hard but Malbolge is another level of toughness.

package com.company;

import java.text.DecimalFormat;

public class XmasLights {
    private final int hoursLightRequired;
    private final int batteryCapacity = 1200;
    private final int ledmA = 20;
    private final double ledVoltage = 1.7;
    private final int ledsPerCiruit = 5;
    private final int batteryVoltage = 9;

    public XmasLights(int hoursLightRequired) {
        this.hoursLightRequired = hoursLightRequired;
    }

    public void go() {
        int leds = amountOfLedsForTime();
        resistanceNeeded();
        drawCircuit(leds);
    }

    //part 1, input is the max amount of leds we can have for that time
    public int amountOfLedsForTime() {
        int maxLeds = (batteryCapacity / hoursLightRequired / ledmA) * ledsPerCiruit;
        return maxLeds;
    }

    public void drawCircuit(int lights) {
        String serialCircuit = "--|>|---|>|---|>|---|>|---|>|--";
        String joiningBars = " |                             |";
        System.out.println("Scheme:");
        int ledsToDraw = lights / ledsPerCiruit;
        for (int i = 0; i < ledsToDraw; i++) {
            if (i == 0) {
                System.out.println("*" + serialCircuit + "*");
            } else  {
                System.out.println(serialCircuit);
            }
            if (i < ledsToDraw - 1) {
                System.out.println(joiningBars);
            }
        }
    }

    public double resistanceNeeded() {
        double voltageOverResister = batteryVoltage - (ledsPerCiruit * ledVoltage);
        double ohms = voltageOverResister / (batteryCapacity / 1000d);
        DecimalFormat df = new DecimalFormat("#.###");
        System.out.println("Resistance needed: " + df.format(ohms));
        return ohms;
    }
}