You can try adding a bigger water bowl for aiding the humidity. Which substrate are you using? Some holds moisture better than others. I use forest floor and coconut husk and have no issues with low humidity despite the fact that I use a ceramic heat emitter. If the under tank mat isn't getting hot enough honestly I'd say the easiest solution is either to supplement with a CHE or just get a higher wattage of mat. They're not as expensive as getting a whole new lighting system.
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