Effect of light source positions and color on a Klein bottle

LightSources -> {{{1, 0, 1}, RGBColor[1, 0, 0]},

{{1, 1, 1}, RGBColor[0, 1, 0]},

{{0, 1, 1}, RGBColor[0, 0, 1]}}

(default light sources)

LightSources -> {{{0, 0, 1}, RGBColor[1, 0, 0]},

{{1, 0, 0}, RGBColor[0, 1, 0}

{{0, 1, 0}, RGBColor[0, 0, 1]}}

LightSources -> {{{0, 0, 1}, RGBColor[0, 1, 0]},

{{1, 0, 0.4}, RGBColor[1, 0, 0]},

{{0, 1, 0.4}, RGBColor[0, 0, 1]}}

LightSources -> {{{0, 0, 1}, RGBColor[0, 0, 1]},

{{1, 0, 0.4}, RGBColor[1, 0, 0]},

{{0, 1, 0.4}, RGBColor[0, 1, 0]}}