This vibrant Fern Green coloured sleeve cover is an easy straight forward way of adjusting your LED T8 tubes light colour. Simply take out your LED tube slip the clear sleeve and fern green filter over it then install the tube again. Such an easy process for something that has been a hole in the LED market for decades. The particular shade colour of the insert is matched up to the Rosco colour code 122 this can be incredibly useful for future purchases and matching up colours. Please note that this product has been cut to 4 foot or 1200mm in length and can fit most brands of LED tube provided they are no wider than 32mm in diameter.