This vibrant 3 foot Yellow coloured sleeve accessory has been designed to match the Rosco code of 101. Not only does it allow your existing LED tube to produce a vastly different colour light but it is also super easy to install. All that is needed is for your existing 900mm LED tube to be removed then have the clear tube and yellow insert slid over the top then reinstall the LED tube. It is suitable for LED tubes that are 32mm in diameter or slightly less. Please be aware that this product comes with two components one part is a clear sleeve and the other is a yellow coloured film insert and it requires both to operate.