I have a 12x12x18 Exo Terra viv planted with Pothos, Monstera and Syngonium for my milk frogs.
I'm currently running 2x 26w Repti Glo bulbs and was wondering if 2x 13w bulbs would suffice instead?
Our electricity bill was quite high this quarter and the vivarium has been the only new addition during this time, I'm just trying to save us some money if possible.

Thanks for your time.