This paper describes the development of an intense xenon gas discharge UV flash-lamp. The emission of the flash-lamp is tailored to serve as a trigger for high voltage and current, photoconductive diamond switches. Xenon flash-lamps are broadly used for many applications, but have not been optimized at high currents (~10 kA), for short durations (<1 μs), and with emphasis on the UV spectral band of 220-250 nm. The diamond photoconductive switch requires trigger UV radiation in this band because it results in bulk and efficient absorption. We present the results of our flashlamp optimization, tailored for UV switching requirements of CVD diamond. The study's emphasis was on small diameter (≤10 mm), short A-K gap (0.5-5mm) xenon gas discharge lamps. Input electrical power on the order of 25MW was typical. Emission power, spectral energy distribution and their associated lamp efficiencies are presented. The optimization studies included variation of A-K gap, fill pressure, and driver current waveform, based on the dominant physics of the expansion of the gas discharge during sub-microsecond operation. Diamond response to UV exposure from xenon gas discharge lamps, in terms of bulk induced photoconductivity and induced charge carriers is discussed.