1. I have
literally never seen red kryptonite used in porn, ever. only green kryptonite. I am sure it exists but it is rare.
2. Red kryptonite
usually does not depower them. so they will still rip you apart during sex.
3. still an expensive super rare space rock compared to literally just having red sunlight initiating bulbs
Also, here is a list of the canon effects of red kryptonite
sauce:
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obviously you won't get such a bulb from walmart. and wrapping red cellophane over a regular bulb won't do it.
but it is absolutely entirely possible to generate artificially via more expensive specialist bulbs. and is in fact done in canon frequently.