UK based electronics technician's expertise needed.

If you fit the above description please pm me. I'm looking for advice on retrofitting an existing LED panel, progrow 550W with new better quality diodes. I understand that the same design of diode must be used throughout because of how they are mounted to the heatsink and their shape. So I would like advice on what type of diode to find too.

Money is not an issue in this instance, I know this will cost plenty but it's not the point for me. So only advice that furthers the objective will be entertained.

Thanks in advance.