Back to the topic... before I bought a studio light (not for above tank but for other filming) I used some cheap Chinese bulbs like this
the tint was awful on skintones and hard to fix in postI assumed it was the lower CRI of 80 or the spectrum had a big spike in greens. Since I jumped to the godox sl-60w with 90cri it became much better. This made me think to swap my T5 for 90 cri bulbs. Inst. ead of the cri 80 osram 865 that I have now. What are your thoughts? I think it differs and that some 80 cri lights could be useable but you don't really know before you have them. Is it safe to assume that cri 90 is always in the ball park of 'good'?
Since CRI is the average of 8 color patches yes each 90 can differ in color tone. You need to look at the spectrum distribution.
Secondly all fluorescent spike in green since that is a primary Mercury emission line.. This is only covered by the use of phosphors.
Same goes for Kelvin or more correctly w/ punctated sources of light CCT.
6500k CCT measured bulbs can all differ in tone (and camera effect) between brands and greatly so.
The 950 bulb I listed (ease of availability ??) has a listed CRI of 98 and a K temp of 5500K
LED's use a blue pump and yellow to yellow green phosphors to create white light.
There is no strong "peak" in green but the tint in low CRI led is pretty obvious.
Good thing is the green cast is self inflicted not endemic as in mercury based bulbs therefor relatively easy to eliminate
though a manufacturers choice.
Some low CRI leds use a more yellow than green phosphor.
Second, we describe four types of typical commercial phosphors for wLEDs, including YAG:Ce phosphors, (oxy)nitride phosphors, silicates phosphors, and Mn4+-activated fluoride phosphors.
Are all 90+ CRI bulbs "good"? ..depends on your use/requirements as shown above.
I assumed it was the lower CRI of 80 or the spectrum had a big spike in greens.
Well sort of, but there are low CRI Leds w/ less green. All depends on the exact phosphor or phosphor mix.
And technically it is more of a hump than spike.
though some phosphors are spikey ie some red emitting phosphors.
I know you are reaching out to people that have used the exact combos of lights in the exact same way you are researching but that will be a long shot.
Best to at least let the science guide you and that starts out with spectrum charts.
So you are apparently stuck with me ATM.