That's the shop in Kuchai Lama that I was referring to in one of my earlier post. Comparing your China 18w T8 tube, this Philips 20w will be brighter but don't expect a lot, roughly 20 -30% but still better and close to normal fluorescent tube.

I doubt with your current wiring setup, the Philips LED tube will light up as both Live & Neutral need on 1 side of the holder but your current wiring is L&N on each side separately. Alternatively, you could go for a local brand of T8 LED with 22w of 2000 lumens. Price is much less than Philips and quality close to it.

To modify, one side of the holder need to have both wires coming out and connect to 'L' and "N' from your electrical source and the other holder side leave it as dummy (wire not connected) .

If your holder only have 1 wire coming out and another wire no where to be seen, you may need to buy 1 holder with both wiring coming out from lighting / electrical shop which is usually very cheap.

T5 is slim version of T8 for Led. T5 comes with bracket 'LN' is at 1 side only as the main pupose of using T5 is to join the light side by side for kitchen cabinet /plaster ceiling cove lighting. Most if not all T5 led comes together with integrated bracket. The tube cannot be detached once its not functioning. Please check the T5 led at shop to understand better and the variety of lenghts available.Yes, T5 led is available in various lenghts.
Btw, this discussion is on T8.
Thanks for sharing. Havent seen this brand of T8 led tube before.

No problem. Glad to share.

Yes. Earthing to the casing as standard practise.
This is to obtain class 1

Sorry. I think I lost you here.
The purpose to connect the Earth wire to the chassis is to act as protection if there’s leakage from AC (Live/Neutral) which will trip the circuit breaker

Yeah. As long as the wire is connected to the chassis