Aqua Man said:

240w will do well but with a dimmer no issue you will have more than enough light with that and extremely good even coverage

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Chad.Westport said:

You'll get a better footprint with the first like most likely. I'm not familiar with that brand, which makes me hesitant. There are many other options around the same price that have a track record and testimonials from growers over the years. Mars Hydro, Viparspectra and Spider Farmer are companies that come to mind. If you are over in the UK maybe look up Invisible Sun as well.

One thing I always recommend people check is the "actual wattage" that it draws from the wall. Many companies will list a 1000w light in the description, but it only draws 200 actual wattage at the wall. So, don't get tricked by naming.

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