I recently acquired some Spectrum King SK400plus grow light. The power supply is wired for 240v plug. Could I just change the plug on these power cables with new plugs wired for 110/120v or would I need to replace the entire power cable? I’ve never used led’s before and probably wouldn’t have had I not come across a deal too good to pass on for the light’s. Thank you for taking the time to read this.
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I don’t believe you can just change ends, the light is just set up for 240 which is 2 hot legs coming in. If you change it to 120 you only will have 1 hot leg. It probly won’t turn on or be really dim. I would contact manufacturer and inquire if the conversion is possible and what it would take to do it…
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Mean well 240 that is good from 90-270v I just don’t know abou tthe cord, whether or not I can switch out plug.
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Maybe, some power supplies are auto-ranging and, in that case, you can. You may suffer a slight reduction in efficiency and output since auto ranging supplies tend to be optimized for the higher input.
In some other cases, power supplies may have that ability but there is some internal wiring (in the case of transformer based conversion) or an external switch that you need to flip or re-wire.
The switch may look something like:
Most recent Meanwell supplies I’ve seen are auto-ranging. What is the model number?
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The light is Spectrum King SK400plus. It is powered by MW240H-36A.
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Auto-ranging. Should be fine. Note that the AC current will approximately double. The gauge of the power cable should be verified that it is sufficient to carry that current. It is maxed out a ~4 Amps, so it’s likely fine but verify to avoid potential fire hazard. Also verify whether there is anything between the supply and the line cord. A switch should be fine but if there are other electronics, that should be looked at for compatibility.
Ensure that you get the wiring correct per the following diagrams before powering on. The color codes may not match typical 120V color coding on the power supply. For the US, black is line/hot (goes to power supply brown), white is neutral (goes to power supply blue), green (with yellow stripes) is gnd.
Terminals on the new 120VAC plug should be labeled with L=Line/Hot, N=Neutral, and G=ground. Or, Brass color = Line. Silver color = Neutral.
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Some power supplies are switching. Look on the label. The input voltage is listed. If it says like 100-230 it’s dual voltage.
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It says 90-277v so it should run fine correct? The driver will sort it out as long as it between that range?
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Absolutely true! And the 120 cord should plug right in the power supply. Some old computer might work.
One done, 3 to go. Thank you all so much for the help. I was already confident in my ability to do it but w/o experience confidence and electricity can be dangerous. All I did was change the plug from 220v to 110v.
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Nice work, Nico.
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