http://warpedspace.org/lightingT/part1.htm - A great tutorial about lighting theory with expressive rendering examples.

http://www.itchy-animation.co.uk/tutorials/light01.htm - LIGHT - a detailed tutorial: THE BASICS
http://www.itchy-animation.co.uk/tutorials/light02.htm - LIGHT - a detailed tutorial: Light direction
http://www.itchy-animation.co.uk/tutorials/light03.htm - LIGHT - a detailed tutorial: Natural light
http://www.itchy-animation.co.uk/tutorials/light04.htm - LIGHT - a detailed tutorial: Artificial and indoor lighting
_________________
Andyba, 3d artist
skills: 3d modeling, texturing, rendering, 3d character animation, compositing
3d software experience: 3ds max, Maya, Softimage XSI, Deep Paint 3d, Body Paint 3D, Wings 3D, Z Brush
2d software experience: Adobe Photoshop, Adobe After effects, Macromedia Flash, Freehand

Maya Lighting and Rendering Tutorials:

http://www.willsmith.org/maya_gi_tutorial_1/Wills_Maya_GI_Tweaking_Guide_1.html - Maya Mental Ray Global Illumination Tweaking Guide.

_________________
Andyba, 3d artist
skills: 3d modeling, texturing, rendering, 3d character animation, compositing
3d software experience: 3ds max, Maya, Softimage XSI, Deep Paint 3d, Body Paint 3D, Wings 3D, Z Brush
2d software experience: Adobe Photoshop, Adobe After effects, Macromedia Flash, Freehand