Solarforce hosts are the go-to. www.solarforceflashlight-sales.com is the terrible website where they can be purchased - the UI takes some getting used to. Shipping is always $2 flat.
These are XP-_ triples, so XP-G2 or XP-L is what they are talking about. Nichia 219B is also a popular option (high CRI @ ~5000k CCT). For MCPCB the triple Noctigon from IOS or MTN Electronics is the thing.
By lenses I assume you’re asking about optics. One of the Carclo 10mm triple arrays always going to be your go-to here: Optics For LEDs | Array You can find plenty of discussion on BLF about which Carclo triple but I think it should generally be 10507 (stock) or 10511 (polished). I have personally used neither.
Another option is to use these for a quads using Dsche’s board and a Carclo quad array.
Heat is definitely an issue when these are driven hard (such as DD). EDIT: took me a second to find it. scottyhazard’s post # 3 here: Jake's Birthday Light