red cree q5

Hi,where can i buy cree q5 red led on 16mm.cheers terry

You probably need to brush up on your terms - Q5 is a brightness bin, not a type of LED. Q5 is not an available brightness bin for Red, the bins listed on Cree’s datasheets are M3-P3 for XP-E and N3-P3 for XP-E2. XP-E2 of the same bin should be brighter than XP-E.

Here is a red Cree LED on a 16mm MCPB from the US - Mountain Electronics CREE Red XP-E on 16mm AL MCPCB but he’s out of stock.
Here is a red Cree LED on a 16mm MCPCB from China - Deal Extreme Singfire Cree XP-E R2-N4 blah blah

The best bins probably are not available on MCPBs, you’d have to purchase them through sites like Cutter.com.au or Digikey, Mouser, etc and then reflow them onto a 16mm MCPCB yourself. There are plenty of tutorials around here.

Cutter has Red XP-E2 P3 on 20mm MCPCB.
Digikey has loose Red XP-E2 P3 LEDs without MCPCB

You’d have to purchase an MCPCB to reflow those onto, such as a 16mm Noctigon from Richard or Hank in the US and China respectively.