520nm diode that can go as low as 510nm ?

I'm hunting for 510nm and it seems there are no affordable options in the market other than buying 520nm hoping it will be <515nm

So I wonder if targeting 5mW output which diode will be a suitable choice to achieve at least 515nm and possibly 510nm ?

I'm sorry if this has been discussed somewhere, I've been away from the hobby for the last few years and my knowledge of such stuff is quite outdated.