@moke: Yeah! I picked up a number of foam core boards a while back. I got some black, gray and white ones. I haven't picked up any colors, but I do like warmer lighting for most things, except when the object is cooler in color itself, then I'd prefer to light with cooler light I think. All of my lights now, have some adjustment in color temp, too, so I can either do very warm for primary lighting, and very cool for backfill or rim lighting. I'm still learning all the ropes of that stuff. But I do like the foam core boards. Very handy!
Since I've started this business, and realize now that I have to make a profit each hear for a few years to avoid being reclassified as a hobbyist, I'm now super conscious about buying anything. I had plans to buy more lighting gear, clamps and stands and the like...but, its probably off the table now until I can prove I can make a profit. I really wish I had more, though, as I'm learning how powerful they are for tightly controlling every aspect of the light and how your scene looks. With the three or four lights I usually use, my control is limited.
Interesting about not shooting shorter than 1/8 sec....I've been trying to keep the exposures short. Maybe that is a mistake? I do use my build in countdown mode. It supports 2 and 10 seconds. I have some remote shutter releases, but they don't seem to work with the EOS R5...I originally bought them for the EOS 5D III.
So, I've been searching for all of these lights you mention. I have noticed a stark decline in search engine quality these days... Most of my searches return irrelevant results now. Searching for garlic light? I JUST get stuff about garlic...the plant itself, foods to cook with it, how to prepare it, actual garlic. Even when I add in photography, product photography, for scene lighting, or any other term...I still, just get garlic plant and food crap. I can hardly find anything anymore these days, when I search online. I use multiple search engines too, and they all seem to suck now.
So I assume garlic light is a slang term...is there an official term for this kind of light?
Regarding color temp, I'm quite familiar with it. I have done photography since about 2008, maybe even before that. So I got into all the photography and lighting terms back then...color temp, kelvin scale, 5500K sunlight, 6500K daylight, etc. etc.

I know all the standard illuminants, etc. I'm a nut for color theory.

I have noticed, however, that the two barn door lights I bought, are definitely not very accurate. In the middle of the range, they may be, but at the extremes, there is a sudden and notable shift. Looking at the panel itself, its a matrix of LEDs, two sets. At the warmest and coldest settings, they just turn off the other set of LEDs. Which really bugs me, because it doesn't deliver a continuous gradation of color temp accurate light. Or perhaps only the two ends are accurate, and everything in the middle is wrong. In any case, I didn't have a lot of money to spend, and the pair of them was $165 I think. Too late now to do anything about it.