A 30W Deuterium lamp which is designed with a hole through the middle. The 100W QTH shines through the hole, giving a combined spectrum of the two lamps simultaneously. For many applications, a single Xenon or QTH source will give better results, but for situations where the xenon spectral lines are unacceptable, this gives an alternative. This product includes two stabilized power supplies (to operate the two bulbs), UV to IR transmissive optics, the housing itself and reflectiverefractive optics for UV to IR transmission. Mounting Type : Horizontal