public void lights() {
    // need to make sure colorMode is RGB 255 here
    int colorModeSaved = colorMode;
    colorMode = RGB;

    lightFalloff(1, 0, 0);
    lightSpecular(0, 0, 0);

    ambientLight(colorModeX * 0.5f,
                 colorModeY * 0.5f,
                 colorModeZ * 0.5f);
    directionalLight(colorModeX * 0.5f,
                     colorModeY * 0.5f,
                     colorModeZ * 0.5f,
                     0, 0, -1);

    colorMode = colorModeSaved;

    lightingDependsOnVertexPosition = false;
  }