Decent enough replacement of LED from old fluorescent tubes. Great brighter white light from LED. (see difference from original fluorescent start light up slowly compared to instant LED in attached video). Given they are not glass like old tubes, they do sag slightly as they are plastic or composite material which is not rigid. These tube are not a simple swap out replacement! The website does mention that they require bypassing of the 'control gear' (ballast unit). Not a straight forward job unless you are an electrician or competent DIYer. No instructions supplied but understandable given there are so many different types of units. My units do not have starters (they supply LED starters with the tubes if you require them). I tried various things (wasting hours) before calling Lampsonline, they confirmed I would have to rewire a feed directly to one end only. I also disconnected the original small and thin push fit wires completely. I eventually managed to figure out how to remove the small wires and use 1mm 2 core lighting cable to rewire supply. Overall, I am happy with these tubes but in hindsight, I wish I had bought complete new units as this would have been so much quicker! LT