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That is, how efficient is it at converting the Watts we’re putting in, with plant-available light that comes out. In order to know how effective a grow light is at growing plants, we need to understand what is its ‘efficacy’. We don’t know anything yet about how well this grow light is actually going to work for growing plants. All we really know at this point is how much it is going to cost us to operate this grow light. Ok, so we now understand grow light wattage and how the energy coming out of our wall socket is measured. You should use the electricity price listed on your utility bill to do this math yourself, but if you don’t have that handy the US Energy Information Administration has a handy list here. The average price of electricity in the US in 2019 was $0.1054, which means that the average cost of running a 20W grow light at 14hrs/day for an entire year in the US would be 102.2 x 0.1054 = $10.77.Do that for an entire year, and we’d use 102.2 KWH.

If we left that grow light on for say 14hours a day, then we’d be consuming 14 x 0.02 = 0.28KWH per day.Let’s say we have a grow light that consumes 20W.To put this into the context of a grow light for indoor plants, it’s useful to consider a simple example. You will probably also see the price per kWh - and if you’re in the US this is likely to be in the $0.08 - 0.28 range. If you pull out one of your utility bills, you will likely notice that they are measuring your electricity consumption (and charging you) based on your kWh consumption. If you left an appliance that consumes 1kW of energy running for an hour, you’d have used 1 kWh. With electricity, we use Watts.ġ000 watts = 1 kilowatt (kW). If we were talking about water, we’d measure flow in litres (or gallons) per second.

One watt is equal to one joule per second. The energy that we use for grow light indoors starts off as a watt.Ī Watt is the global standard for measuring the rate of energy transfer. How Much Electricity Do Grow Lights Use? Why Grow Light Wattage Is Not As Important As You Think

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