your in luck because i just got a new bulb two days ago for my new tank.
heres a pic of my set up tank
u can see its a clamp on fixture i got it at big als it a reptile fixture but NOT a heat fixture. think it was 8-12 bucks
heres the bulb as u can see its led, 15 watts dimmable. its extremly bright because its a exterior flood light so its weather proof and its only $24 bucks and i buy them at costco. my cheato grows crazy and its a very cheep alternative. and u get no heat off this setup eather