The Ushio double ended lamp is a super high pressure sodium Double Ended lamp for indoor Plant Growth. High red and blue spectral ratios for excellent photosynthesis efficiency. Great lumen output for high PAR values. Robust plants through high blue light output. High red light ratio for tight, dense flower structure. Economic (long average life, high lumen output, low energy consumption). Tubular low profile design for compact fixtures. The jacket of this double ended lamp is made from quartz glass. Do not handle with bare hands. If you need assistance in determining if this bulb is right for your set up give us a call and we will be happy to assist you!