Altering your existing 600mm (2ft) LED tubes output to an incredible Primary Green coloured light this sleeve accessory boasts ease of installation for maximum gain. To install this product you must remove your existing LED tube slide the coloured insert and clear sleeve over it then re-install the LED tube. Once installed the light output will be emitted in the primary green colour which is matched to the Rosco colour code of 139. the 32mm diameter is suitable for most brands of LED tube however please check that yours are the correct size to fit this product. Important note - this product does not require end caps and comes as two components (clear sleeve with coloured insert).