If you want to learn more about the best grow light bulbs on Amazon, click here : Grow Light Here are our best screw-in E26 indoor plant grow light bulbs based on efficacy. We, therefore, have a strong preference for LED over CFL type screw-in bulbs. So, not only is the units of ‘Wattage’ somewhat useless in evaluating grow lights but on top of this, some manufacturers don’t even tell you what the true wattage is (!!).Īs we showed in our Video Review Of Amazon’s Best E26 Grow Bulbs you’ll notice there’s a huge difference between the CFL (compact fluorescent) and LED (light-emitting diode) type bulbs in terms of the PAR value they are able to generate per watt of energy consumed. ![]() We know because we have a tool for measuring wattage and we’ve tested these globes. What they’re trying to do here is tell you something about its brightness, by comparing it to the older type of incandescent light bulb.Ĭurrently, on you will find indoor grow light bulbs listed as “100W”, but this is actually an ‘incandescent equivalent’ wattage and not a true wattage. Some manufacturers will also quote what’s known as an ‘incandescent equivalent’ wattage. To learn more about grow light efficacy and the various ways that grow lights are measured, we recommend reading our article, ‘ Grow Lights For Indoor Plants – How To Measure It, and Understanding Watts, PPF, PPFD and DLI ’. The ratio between Energy In and Plant-Available Light out is known as the ‘efficacy’ of a grow light. Your plants care much more about how much useful light comes OUT of the grow light. Instructions to use the grow light calculator: Enter the wattage of your indoor plant growing light (add up the total, if you are using more than one), hours per day of usage, and electricity price and the spreadsheet will calculate your annual running cost.Īlthough it is important to understand and monitor your energy consumption, the truth is that your plants don’t really care how much energy your light consumes. We’ve included a simple calculator below that allows you to calculate the annual running cost of your indoor grow light. Fortunately, today’s LED and CFL indoor grow light options are all fairly energy efficient, and the difference between a high and low energy user is likely less than $10 a year. The wattage of an indoor plant growing light bulb tells you how much electricity it consumes. That’s a nice way of saying that they don’t necessarily need to ‘look’ like an indoor grow light.Įnergy Use: How To Measure Indoor Grow Light Intensity
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