... lamp ( Type F,G,H,I), 22w(A,B,C,E). Its active arm is a special design. Which can be ... . If for long time observation,rectangle 177x113mm is a better choice because its shape change is smaller than ... If the adjust arm is too tight. Please loose a little. After adjusting well the direction and position. wrest ... the arm tight. Do NOT force it to move. which can cause parts ...