FYI, Maybe my topic can help (a bit), or give you some suggestions:
- link to the topic
- link to the post with my found solution
Gracias, aprendí a usar el apartado dato.
{ "brightness": "190" }
con esto le sacare mas jugo a TODAS mis entidades, en Node-RED. 
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That was all the info I wanted when I looked at this post. Thanks for the perfect info!