Have the tubes now 1 week add operation (Keller) and am very satisfied. Light intensity very good, very light color white, initially irritate, but quite useful. Delay approx 0.2 seconds, but then immediately 100% light. Nonsense in my opinion the announcement "sharing by Fachkaft". It has the old tube out, then the old starter out. Then LED starter (supplied) and pure new tube pure, ready !. The big question now is the shelf life ...