Probably best explination i've seen to look for top
"All the talking heads have been noting the 'light' volume in this market grind and how that doesn't show the conviction of the buyers. This is horsesh*t. This volume is the most dangerous kind because it is relatively medium to light. Do you know when 'HEAVY' volume comes into the market? At the TOPS and BOTTOMS--- ala shooting stars and hammers... capitulation. So when the BIG VOLUME comes in... thats when we peak--- don't let the dillweeds fool you, heavy volume indicates the final wave of buyers. Granted volume alone is not the only indicator... but heavy volume + shooting star under upper bbs = exhaustion = shorts, what you don't want to do is short the light volume grinds--- this is what will also fuel that big volume surge when shorts also throw in the towel. So be patient" --underground trader
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