Not a waste of money....
True they do not emit any UV wavelengths, but they have excellent CRI and intensity. While Reptisun, Zoo Med, etc. flourescents have the UV rays - they aren't all that great in other respects. I buy dual fixtures for my herps - one for the UVB bulb and one for the "Sunshine" to help appetite and normal behaviors.
Now, whether or not your geckos need good CRI and intensity is another question. How many of you use UVB bulbs with nocturnal animals?