Sylvania 11560 - ECT - Photography Lighting - PS25 - Photoflood - Frosted - 500 Watts - 120 Volts - Medium Base - 3200K Incandescent bulbs are dimmable bulb and din not a have poor quality light as low energy bulbs best used in household and commercial lighting, decorative &amp; advertising lighting, portable lighting Stock now on Incandescent bulbs before 2012 phase out of incandescent light bulbs Osram Sylvania PS25 incendescent bulb, 500W, 120V, Base: E26 Medium Screw, Rated Life (hrs): 60, Luminous Flux: 13650