Case of 24 GE brand light bulb type ECA, Photoflood lamp 250 watts, 120 volts 3200 degrees Kelvin photo quality lighting. For many photographic applications including projectors, studio lighting, etc. Also works in Artograph projectors: Prism, Super Prism, Designer, DesignMaster, and DesignMaster II projectors. Also for use in Kopykake brand projector models KD200, 300XK, and K1000. Email for large quantity discounts. Made in USA.