THE GROW SHOP PRODUCT TIP: THESE DE (DOUBLE ENDED)LAMPS ARE THE HIGHEST YIELDING STYLE OF LAMP ON THE MARKET. ALLOW FOR MORE HEAT FROM THESE LAMPS AS THEY BURN HOTTER THAN SE (SINGLE ENDED) LAMPS. TAKE THIS IS INTO CONSIDERATION WHEN SIZING UP YOUR VENTILATION FOR YOUR GROW ROOM OR TENT. ALSO CONSIDER THAT THESE LAMPS NEED TO BE 1M OFF THE CANOPY AT LEAST SO BUYING A HIGH TOP TENT WOULD BE ADVISED.