There should never be any need to convert a color from HBS format to RGB format, because once a color variable is saved, it doesn't change based on the color mode! That is, the current color mode has nothing to do with the color stored in a color.

So have your user enter the hue, Brightness, and saturation, set the color mode to HSB, save that color, switch the color mode back, define your light's color, save it, then use both values.

I see what you mean.

As said in the other thread, you give incorrect values: here, you define a max value of 100, but provide a value of 550.

Yeah, well I'm not that good with HSB values...

Well, it looks like you are trying some random things.
For example, I hadn't noticed lighting, which is a color defined from its RBG value, as the hue nuance of tint(), but hue isn't defined like that.
You should read a bit on HSB, eg. on Wikipedia, to get a better grasp of the concept.

For example, with the following code:

1. int LBrightness=90;
2.  
3. PImage temperat;
4.  
5. void setup() {
6.   size(500, 400);
7.   temperat=loadImage("stuff.png");
8.   colorMode(HSB, 100);
9. }
10.  
11. void draw() {
12.   tint(20, 50, LBrightness);
13.   image(temperat, 0, 0);
14. }

the background is greenish.

Well, they're not entirely random.

Can I use:

There are formulae to convert between RGB and HSB, perhaps you can use them?