The first hint to crack the puzzle "Sending out light or heat" is:

It is a word which contains 7 letters

The second hint to crack the puzzle "Sending out light or heat" is:

It starts with letter r

The third hint to crack the puzzle "Sending out light or heat" is:

It ends with letter t

Looking for extra hints for the puzzle "Sending out light or heat"

Click on any empty tile to reveal a letter

The answer for the puzzle "Sending out light or heat" is: