How do you light a really big thing with one light?
Most will have heard of 'painting with light', the process of building up illumination on the subject you are photographing whilst leaving the lens open and shooting in a dark place, when done well it can be a beautifully creative process.
You can also do the same process using flash / strobe lighting, again in the dark so the only light that is affecting the subject is the light you are putting in, alternatively it can be done by taking lots of separate images and merging them into one to create a composite.
How can this be done in daylight with modest flash equipment that is not powerful enough to 'over power' full daylight and make the ambient light significantly underexposed.
Using the Hypersync function on Pocket Wizard flash triggers, really meant to allow sports shooters to use higher shutter sync speeds than the camera manufacturers recommend allows the ambient daylight to be significantly reduced.
The shot of the engineer and truck is made up of @ 45 individual frames, each section or detail has been illuminated separately, then all merged into Photoshop layers.
The end result creates an image with great well defined detail and creative control over the light balance.