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The devil is in the details. Can you provide a link, or the brand name? Many LEDs on the market are advertised as "100w" when in reality they only pull around 20w.
A good way to tell is by the price. Expect to pay $1-2 per true watt of LED. A good 100w light will run you at least $100. Here's an example:
If it is a true 100 watts and the diodes are name brand, it should be enough to grow a small plant to maturity with a decent yield. However, if it is really just an overhyped 20w, it will barely be enough to grow anything.
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