Well these are alpha alpha screens. Without High Dynamic Range (HDR) lighting. if I am not mistaken the expation pack of HL2 would also have HDR.

[edit] halflife² HDR movie

also HDR lightning means type X800 or GeForce 6800 gpu

Damm my 6600gt (when it comes out prooly need a better gc)

Not in the mood for cheese?
That excuse has more holes than a slice this fine Gorgombert!