There are plenty of lights with dedicated auxiliary flood LEDs. Eagletac makes an entire line of them but uses a ring of LEDs built into the head. Sunwayman and Streamlight and Pelican also have a few with lights with an auxiliary flood. (In my database this is under the "features" filter with the "flood and throw" checkbox.)
You are right that actual COBs aren't common. I suspect that part of this is from construction difficulties. A large window in the side of a light is difficult to waterproof. Additionally most of small COBs can't put out any more lumens than a typical high output LED. Cost too is about the same. There is nothing to gain by using them.
I really love your website, Parametrek. But I disagree that "most of the small COBs can't put out any more lumens than a typical high output LED". And from what I have seen, 95% of all flashlights are not (100%) waterproof.
Actually, 'technically', you might in fact be 'correct' but I've seen with my own eyes how COBs "disperse" their lumens, and to me, that makes me VERY much appreciate the COB lights I have and give out. Of course, most of my lights are NOT COB lights, but I appreciate the COBs just AS much, and I think this explains their appeal and popularity. They emit or emanate light differently and we can't afford to minimize that.
One example that comes to mind is the Flip light, the "lightswitch flashlight", put out inexpensively by Harbor Freight. Recipients tell me how much better they can see their closet, their dorm room, their bedroom. And what a brilliant way to conceive of a (flash)light!
A second example is Nebo's Pink Li'l Lucy or the Lil Larry. Their throw is neatly amplified by their spill. No, they can never be confused with a true "thrower", but such is not their purpose. COBs help expand our understanding (and appreciation!) of light emitting diodes.
Although I admit I need to learn more (don't we all, haha!), I think the COBs tend to be more seductive of non-flashaholics while making a few of us true flashlight "dependent/loving" folk genuinely appreciative of their uniqueness.
We have everything to gain by understanding their uniqueness and their applications. Therein lies not only their limitations but also their strengths that I've tried to enumerate here.
With only 12 notes of the musical staff, new music continues to be written. With only 26 letters of the English alphabet, new thought continues to be expressed.
And with different ways to emanate or disperse light, a not very high number of lumens continues to enthrall and "enlighten" and bring joy to many.
- LetThereBeLight!