What type of bulb need - E26/E27 base architect lamp, Bulb is not included, please buy 7W led bulb, equivalent to 60W incandescent\nUser-friendly - The writing desk lamp with 51 inches long cable and easy on/off switch facilitates your everyday use\n2 Function - With 2.5 inches wide clip, architect lamp with clamp can be cliped on any table shelves that are vertical or horizontal.You also can stand the study lamp on its own by heavy duty base.Have more flexible use than fixed light to decor any places like office, dorm, bedroom, etc\nStability - Solid metal and black finish for architect lamp swing arm and lamp shade which is durable and exquisite, led architect lamp stands firmly with weighted base.\nFlexibility - Swing arm task lamp with three rotatable joints (at the base, arm connection and the lamp head),The adjusted arm can be extend up to 18 inches.