I'll just edit this tomorrow to include how I did it. I'm sleepy na
--- UPDATE ---
PS layers from top to bottom (essentials only, there are actually more layers but not needed to get effect)
1. Lightsaber effect (Blending Options -> Layer style -> Outer glow)
2. Photo taken under normal lighting (Filter -> Render -> Lighting effects & Blend mode: Lighten)
3. Photo taken under low-light
I need two photos because had I used only the low-light photo, adding the lighting effects wouldn't make Darth Maul's face any brighter. A flickr member pointed me to a lightsaber effect tutorial but I read articles that even the Star Wars movies made a mistake of not putting a glow in the wielders' faces when they turn on their lightsabers. So I played around with CS2's lighting effects filter until I got it "right" (still far from perfect). I still haven't figured out how to create user-defined shape for omni-lighting. Its default is circular.