Great modification Chamberman and discussion of options by others with links to materials.
I use a 3/4 inch Close PVC to change the bathroom light into a nightlight, here is the link for the riser. These are normally used in irrigation systems to install sprinklers and such, they are fire resistant.
https://www.homedepot.com/p/Orbit-3-...126931#overlay
The first picture shows the light without the cover. The cover is easily removed. I use a small LED bulb shown on this link and the riser easily clears the bulb. Sorry that the pictures are rotated, the fixture is wall mounted,
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
The second picture shows the riser covering the LED light bulb, note that it touches the bulb when the cover is off.
The third picture shows that with the cover on, the riser is rotated to the vertical; the riser is now not touching the bulb. The light is on but it is daytime with the door open so you cannot see the nightlight effect.
The fourth picture shows a nighttime view of the nightlight. Longer risers decrease the light even more, but we like the lighting with a close riser.
This is an AI overview from Google when I searched for PVC Flammability:
Polyvinyl chloride (PVC) is a fire-resistant plastic with several properties that make it flammable than other materials:
Ignition temperature: Rigid PVC requires a temperature over 150 degrees Celsius higher than wood to ignite.
Limited flame spread: PVC produces a charred material that prevents flames from spreading, unlike most other plastics.
Self-extinguishing: PVC is naturally self-extinguishing because it contains chlorine, which slows down combustion and prevents oxygen from reaching the surface.
Low combustion heat: PVC releases less heat when it burns than other plastics.
Few flaming droplets: PVC produces few or no flaming droplets or debris when it burns.
Smoke production: PVC produces more smoke when it's on fire, but similar smoke densities to wood when it's not on fire.
PVC's fire properties are due to its chlorine content, which is one of the few elements that gives polymers good fire properties
I did a couple tests to determine if the risks due to fire or overheating was no higher than low.
First I used a propane torch to try to light a PVC riser on fire. The riser eventually started to melt and char without producing drops and when I finally got it to ignite, the fire went out quickly after I removed the torch flame. I think the risk due to fire is negligible.
I then tested for overheating by installing the riser and turning on the light. I put another riser on the ground outside of the trailer and turned on the inside light next to the door. I closed up the trailer and left in alone for 6 hours, from 10:00 AM to 4:00 PM.
It was a warm day. The peak air temperature was 90 degrees and there were no clouds and no shade. The elevation was 4,200 feet. The trailer was parked almost perpendicular to the sun travel so the trailer had good adverse solar loading on the passenger side.
After 6 hours, the PVC riser in the bathroom was 108 degrees F and the PVC riser outside of the trailer was 104 degrees F. The light bulb in the bathroom was 132 degrees F and the light bulb in the other fixture was 128 degrees F. I think the 4 degrees increase in temperatures is insignificant and the risk due to overheating is negligible.
The PVC riser works well for us. It is easy to use and costs less than 75 cents. I think it presents a negligible risk.
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