MAXIMIZE YOU LUMENS! Mogul to Mogul Adaptor 600W - precise adjusters to extend socket and center bulbs in fixed socket designs Use with Hydrofarm reflectors to insure optimal positioning for either 400W or 600W bulbs. The spacer centers the bulb for better uniformity and efficiency. Works for all fixed socket Air Coolable reflectors: Daystar, Radiant, and XtraSun Series.