I think this is a really good time saver especially if you get the jump the first time. Just got to get on the left most of the lamp and jump. I kind of goofed in the Vid.
Hum, I tried to do this to but never succeeded. Once again goo job ! But you really have to stop to bunny-hop. The player speed is only determined by the value "groundspeed" (600 by default), and you gain nothing from hopping.
The jump here can be tricky too : here's the 100% chance method :
jump on the lamp with enough speed and with the right angle. Once there, aim at the Nadir to use your crosshair as a marker. Take enough momentum and jump on the side. Just use the "strafe right" button, and no other key. Curve the trajectory a little with a slight wave of the mouse, and you will magically land on the crate. The hardest part is to get on the lamp, really...