  The presence of moonlight is usually a limiting factor for imaging
atmospheric Cherenkov telescopes due to the high sensitivity of the camera
photomultiplier tubes (PMTs). In their standard configuration, the extra noise
limits the sensitivity of the experiment to gamma-ray signals and the higher
PMT currents also accelerates PMT aging. Since fall 2012, observations have
been carried out with VERITAS under bright moonlight (Moon illumination $>
35\%$), in two observing modes, by reducing the voltage applied to the PMTs and
with UV bandpass filters, which allow observations up to $\sim80\%$ Moon
illumination resulting in $29\%$ more observing time over the course of the
year. In this presentation, we provide details of these new observing modes and
their performance relative to the standard VERITAS observations.

Instrumentation and Methods for Astrophysics