RE: Uploading set data in the context of AIML 2.0

You would need to define "light red" as a compound word.
Try,

{#data : #lightred, instantiation : #color, word : "light red"}
{#data : "light red", instantiation : #word, instantiation : #compound-word, meaning : #lightred}
{#data : "light", instantiation : #word, compound-word : "light red"}

But this may only work in Self, it may not work in AIML.