Quoted from newmanoconnor:schwaggs start here...watch the video midway down...https://pinside.com/pinball/forum/topic/sttng-comet-leds-for-the-shields?
You're talking about this video?
If so, both of the LEDs shown look pretty bad to me. They do dim, but they both flicker at lower brightness. The author of that post also says:
Quoted from JBBOPT:I tested incandescents vs 2 flex optix vs optix maxiums, maximus almost flickers more and was a little overpowering on the areas inserts.
my next try is the smd5050s linked above im thinking of ordering 9 of the frosted cyan or maybe clear?
It sounds to me like he wasn't satisfied with the results.
I don't care if you buy a board or not, but I've seen you asking this question in what feels like half a dozen threads, and some very knowledgeable people have responded. I do not think that good results for both dimming and flicker rejection are possible in a standard sized LED. To avoid the flicker, you end up using capacitors, assuming you can find high enough values that are small enough to fit. Those end up charging to the input voltage and the LEDs will show near full brightness.