How to light a set using coloured fluorescent lights
Try searching for "LED Neon Tube".  Nowadays LEDs are so common for venue lighting, maybe the set designers might went that route.

If this is fluorescent, they could be white fluorescent bulbs wrapped in theatrical gel roll material, such as this.  For the power supply (called a ballast) and housing, you can buy fluorescent bulb track lighting from any commercial lighting store. The ballasts for traditional T8 and T12 size bulbs are being phased out due to regulation.  But my local supplier still had a couple in stock a few years ago.

The bulbs could also be neon, producing a native red color without a filter.  I believe those would have to be handmade by a signage company.

Also, the shot has pretty obvious red stage lighting to the lower-left, and blue to the upper-right.  I'm judging from the red light and shadows striking the ceiling, and the diagonal blue light shadows on the actor's body.  My guess is that almost none of the light in the shot is from the vertical bulbs.

I'm a newbie at this too, but hope some of my information is accurate :)  I had a similar project for a party production a few years ago, which involved fluorescent ballasts and housings with vertically mounted blacklights.