Phosphor layer arrangement for use with light emitting diodes. The toner has, in a DSC curve obtained by measuring the toner with differential scanning calorimeter, a glass transition temperature measured in a first scan of 50. The adaptation sleeve can be attached at the hand piece, wherein the adaptation sleeve is equipped with a connector for receiving a suction hose. The optical imaging system defines an observation beam path which is guided through the lens system so that, in the first main plane and in the second main plane, the observation beam path is at a distance from the optical axis. This invention also features a pharmaceutical composition in which the spirolaxine of formula acts as active principle in association with the all-trans retinoic acid of formula for the treatment of those pathologies responding to the activation of the PPAR\u03b3 receptor, such as the acute malignant haemopathies. The variable angle cutting block comprises a first portion, a second portion, and an angle adjustment system for positioning the first and second portions at a relative angular position upon rotation of the second portion with respect to the first portion.