... fluorescent lamp (Type F, G, H, I) , 22W(A, B, C, E). Its active arm is a special design, which can ... is Φ90mm plus Φ12mm; Type F,G,H,I are 177×113mm rectangle lens; A, B, C, E is Φ127mm ... If for long time observation, rectangle 177×113mm 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, ...