What does the color "sto 16024, HB 81, C1" mean? Correction of wrong decision.

As noted in another thread, we decided on the color for the exterior facade (including the base) "sto 16024, HB 81, C1", "silicone resin, diffusely open", "scratched plaster K3" during the sample selection. At the sampling, on the small panel, the color appeared very warm and bright to us, which we expressly desired. When I googled this color on the internet, I only found a color sample for "sto 16024" (see photo), which is much too dark for me.

Does anyone know what the additional designations "HB 81, C1" mean and whether they indicate that the color is overall lighter than "sto 16024"? Your feedback is very important to me, as we still have the opportunity to correct the choice of color at the moment. Thank you very much in advance. :-)

HB could stand for lightness value. 100 is white, 0 black.

Colors on PC monitors that, bluntly put, cost less than 2000€ are displayed incorrectly. Better get a color fan or sample pieces from the manufacturer.

HB less than 30 usually requires additional measures because the surface heats up too much in the summer.

C1 means color tone class 1, there are C1, C2, and C3.

The higher the C value, the higher the color tone content. Dark red has C3.

It is then more expensive and also fades faster. I would always choose C1. Otherwise, you have to paint every 5-10 years.

Dark tones are actually bad in every respect. Especially light bird droppings then make facades unattractive after a short time.

The sun-exposed sides lighten up. You avoid these problems with light colors.

Don’t drive yourself crazy about the color. The color looks different on every side of the house and in every weather. It also depends on the substrate.

Although I plastered myself, I know there are painters who apply a white plaster base and others a colored one. I would always take the colored plaster base. Same color as the color plaster.

I chose a similar color. It took weeks because of every color nuance. I just took one in the end. The more colors you see, the more indecisive you become.

Addendum: I have now found a photo on my phone (attached*) from the sampling, in which the color appears much more delicate and lighter, even when considering the different displays.

Does the value "HB 81" indicate that it is the color "sto 16024" from my initial post, but significantly lighter than just the color labeled "sto 16024"?

Sounds complicated, I'll make it simpler: ;-)
Is "sto 16024 HB 81" lighter than "sto 16024"?

Thanks. :)
(I am working on the color chart and similar, but it will take some time.)

*I am still trying to upload the photo from my phone, but despite conversion, I cannot upload it as .pdf, .jpg, .jpeg, etc. If possible, I will provide it later. For all formats, I receive the message "The uploaded file was not an image as expected."

For comparison: RAL 1015 taxibeige has a lightness value of 68, RAL 9010 pure white of 85.