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@Tremex - the lazers can be turned on, as long as you press the buttons, one of which requires the right height which can be achieved with portals and simple jumping. the buttons and lazers are a crutial part of the test and go towards 50% of the chamber's difficulty (somehow). and the button that the wave leads to a needs a cube to activate.
if you guys need a walkthrough, i can give you one. :P