... . A) SummarizeMagnifier series are F-500A,F-500B,F-500C,F-500E,F-500F,F-500G,F-500H,F-500I (including green glass and ... U shape fluorescent lamp ( Type F,G,H,I), 22w(A,B,C,E). Its active arm is a ... voltage or not.2. When changing magnifier's direction and position. If the adjust arm is too tight ... . Please loose a little. After adjusting well the direction and position. wrest the arm tight. Do NOT ...