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Generally speaking, the higher the wattage of the bulb, the more light it produces. The more light that is produced, the better your plants will grow. An excellent way to measure the amount of light you are getting per square foot is through the use of lumens. Wattage and lumens tend to go hand in hand, but can vary from system to system. And even though lumens tend to correlate with wattage, the design of the light can have a massive impact on the actual amount of lumens emitted.

There are three factors to consider when deciding how many lumens you need. These are:
Size of the grow area
How many plants you have
How large your budget is

Basically, the greater the amount of lumens you cast over your grow area, the stronger your cannabis plants are going to grow. Each plant requires an absolute minimum of 2,500 lumens, and a standard 400W HID lamp will usually emit 45,000 lumens. That should be enough to comfortably grow up to 12 cannabis plants in a 1 sq.metre area – with enough lumens to cause strong growth.

You will also have to take into account the strain of cannabis you are growing. One large sativa may take up the entire area you would use to grow many smaller Indicas. Thus, if you are planning to grow a lot of sativas you will need a bigger area and more lights to cover them.

Whilst having 45,000 lumens within a 1 sq. metre grow area will get you good results, having a light with a higher wattage that produces more lumens within the same area will help you achieve even better results. It all comes down to how much you want to grow, what lighting system you can afford and what you are prepared to spend on electricity bills. The stronger the light, the more it's going to cost you.

400W and 600W light bulbs are the favourites of indoor cannabis growers. Some growers even use light bulbs with 1000W, which is logical when you consider 'more light = bigger yield'. But watch out; the more watts you use in your grow room, the hotter it gets, especially with 600W and 1000W light bulbs, as the temperature can become way too high for your cannabis plants.
So be prepared to do some temperature control when using strong light bulbs. ​

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