Looking for the best way to attach your COBs to your heat sink? Use a COB holder.
COB holders make it much easier to fix your chip to your heat sink and, more importantly, they make wiring far simpler as well. Rather than soldering (which sucks), COB holders offer “poke in” connectivity instead: just strip your cable and push it into the designated holes in the holder. There aren’t many manufacturers of COB holders – the 2 brands that are most prominent are Ideal and BJB. Some COBs (like Bridgelux Veros) don’t require holders at all.
Another advantage of using holders is that you can also fit reflector adapters onto them. Once the reflector adapter is in place, all you have to do is twist your reflector on.
In terms of reflectors, LEDiL is the most popular brand for our niche. LEDiL makes a huge number of different reflectors in various colors, materials, and angles, and its ANGELA and ANGELINA series are the ones you’ll see most often for the COBs that indoor growers use. The ANGELA series measures 120mm in diameter, while the smaller ANGELINA series comes in at 85mm. Both ANGELA and ANGELINA come in a variety of different beam angles, denoted by the suffix on the part number. For example, an ANGELA-S refers to a “spot” angle (very tight), an ANGELA-M is a medium angle (say, 30 degrees or so), an ANGELA-W is a wide angle, and an ANGELA-XW is an extra-wide angle (think 70-90 degrees).
Below are the part numbers for the holders and reflector adapters of the most popular COBs. The Ideal holders require separate reflector adapters if you want to to attach a reflector, but the BJB holders have this adapter built-in and don’t require a separate part: