Exoterra Galerie Compacte Top 12" 1 Douille pour Reptiles et Amphibiens

Q: Will a 15w light bulb do anything for small light fixture?

Sure, a lot of people use the 15W blue bulbs with no issues (ie: a blue night bulb for ambient low heat or night viewing). BUT on this fixture, both bulbs are on at the same time (you cant operate them independently) so using a night bulb and a regular bulb for illumination wouldn't do much aside from raising the temp in the terrarium. Personally, I have 2 fixtures on 1 terrarium... 1 fixture (the small) with 26W CFL bulbs (2) for my plants and day cycle then a second (the micro fixture 1 bulb version) with a 15W blue night light so I can watch my RETF's eat at night. Hope that helps.PS: I really wouldn't use 2 regular 15W bulbs for illumination , It just seems like it would be to dim... especially if you want to have plants.