Concept Phase: Sketching helps quickly document concept thoughts without having to spend time detailing all the finer details. It relieves the mind from having to keep track of each concept and also try to come up with new ones.

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Concept 3D phase: The sketches are filtered and explored in 3D give a more definite form which can be presented to the client.

Detailing Phase: The selected concept has options, both for spread and for focus light. The concept is modeled with more details incorporating all the smaller details like the indications, switch, logo etc.

More details into the design 

The "Focus" and "Spread" options

First impressions - 3D printed working samples