There are two parts to this model:

• A holder for the daylight lamp with for screw holes at the back in 15mm x 15mm square
• A pipe clamp that can be screwed to those holes, and used to attach the lamp to various light fixtures.

Almost all parts can be printed without supports, only the pipeClampB.stl will need a support on one side, this part also has a small build-in support on the other side, between the two “fingers” that will need to be removed after printing.
Everything should be printed in the orientation as they are in the file, ideally with 3 or more perimeters.
 

The screws on the back of the light holder just screw directly into the plastic, in my experience this has worked well enough, and there was no need for captive nuts or heatsunk nuts.

You will also need:

• 4 M3 x 8mm screws
• 3 M3 x 30-ish mm screws
• 3 M3 nuts
• either 1 thumbscrew nut, or one additional M3 nut

The pipeClampC.stl has a space to place an M3 nut, should the screw be to loose in the part and turn when trying to unscrew the thumbnut, but in practice I haven't found this necessary.

The lamp model is called “Light Therapy Lamp, Model HYG-01” it can be found on amazon here:

https://www.amazon.de/dp/B097HP1NCG
https://www.amazon.com/dp/B099ND7XKC