Replacing T8 fluorescent tubes with LED tubes

I would replace with a reputable make like Philips again, steer clear of lap.

 

As Arrow, far better to fit a proper LED fitting made by a reputable brand.

 

If the original tube uses a starter, yes, if the original is a HF fitting then you really will need to replace or rewire inside.

Note the original would have had an output of around 5000 - 6500 lumen depending on the ballast fitted, so the new one has only half the output, however in the main 6 foot was to get the spread of light, and likely does not need that output. And the fluorescent aged more than LED's do.

Clearly a ballast does use some power, so the 24 watt is what the tube uses, not including the heat generated by the ballast. So this becomes this if you want to gain the full benefit, the wiring should go to both ends in series, as although only one end of the LED needs power, unless done as shown, if tube fitted wrong way around it would be a dead short.

The HF ballast lamp could be rewired the same way, some LED tubes are designed to replace a fluorescent with a HF ballast, but not all. HF ballasts do not have a starter, early days some wire wound did not have starters, but that was a long time ago when we used the fat tubes.