The Form Ten semi-sphere is a dome shaped, cylindrical cutoff luminaire. Its softer silhouette lends itself to integration with curving architectural structures, or may be tastefully used to provide an interesting counterpoint to sharply defined structural lines. Semi-Sphere luminaires accommodate all six Gardco optical systems and accept HID lamps from 70 to 400 watts. Like all Gardco luminaires, housings are sealed against penetration by insects and the elements with high compliance memory retentive, extruded silicone gaskets. Housings are spun aluminum with a circumferential reveal.