Legally DrLava does not owe you anything except a refund of the preset cost, or the shipping and labour involved in getting them to him, presetting them and returning them to you. If a product "obviously differs" from what you have ordered, and you choose to use it anyway, the seller is not responsible for any damage which may occur to persons or other components due to this. If you even neglected to read the manual, which would clearly have told you that the drivers were not preset, you have even less of a case.
In my opinion DrLava is very kind in giving any compensation for the diodes in question. You should accept his generous offer.
Seb
In my opinion DrLava is very kind in giving any compensation for the diodes in question. You should accept his generous offer.
Seb