SunBlaster Ultra Clear Vented 7 Inch Humidity Dome with Light Tracks For T5 Reflectors These excellent quality 4 and 7 inch Ultra Clear Humidity Domes now have built in light tracks that accommodate the 18 inch Super Sprouter T5 HO Grow Light Fixture The light tracks are directional to allow the light to run the length of the domes or the width of the domes, allowing two trays to run side by side Vertical sides allow the use of all plant sites in a propagation tray