This post might be helpful to solve your request --> Node-RED google home integration
Math.round((value+1) * 2.55) where value is between 0-99
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Or use the range node to do it for you.
In fact to map 0-99 to 0-255 you should have
Math.round(value * 2.5758)
but better to use the Range node as suggested.
Yes. But YAGNI 
Not quite sure what is intended by that, if you mean it isn't needed because the Range node is better then I entirely agree. If you mean that the the original formula was actually good enough then I don't see that. It gives wrong answers (0 maps to 3 instead of 0) and also it is less efficient as it involves an extra addition, so hasn't got much going for it.
you are totally right, the +1 should go but the value of 2.5x might just as well be rounded to 3 or even 4. You are not going to 'see' 255 different levels of brightness with a tradfri light.
Well personally I couldn't sleep at night knowing that I had put the wrong multiplier in when I could have just as easily put the right one (or at least right to an appropriate number of significant digits). Maths is too important for that.
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Solved it guys, with some help from you and other forums
my flow now, ON and OFF and bridgtness is working
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