Holding Elect. Tubing Agains House Siding Clapboards ?

Hello:
Will be putting up a plastic tube to hold the wires leading from my deck to a flood light mounted about 10 feet above it. It's the grey electrical tubing; not sure what the right terminology for it is.
Will want to clamp it against the siding in a few places.
As the siding is the typical horzontal clapboards, there really isn't a perfectly flat surface for the typical clamps (the ones that encircle the tube, and have a screw hole on each side). Would like to do a really neat job.
Are there special clamps made for this purpose ? If so, name, and where might be obtained ?
Thanks, B.
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Same place you got the tubing (called conduit) from.

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to
PVC conduit.

Two-hole PVC conduit straps.

What you have is fine. Install the straps at the high point of the siding so that they do not pull the conduit in too much. No need to over tighten. You can predrill the siding with a smaller drill bit to prevent splitting. Use a long enough #8 sheet metal screw to catch the underlayment.
If you want to get fancy you can use pipe hangers (We call them "Cowboys" in NJ). Use one screw to secure them in place and then place the conduit in them and tighten the clamp. Another expensive and unattractive way to go is to use strut with strut clamps.
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its more work but the wire can be fished inside the wall for a neater more pro install
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