Light placement?

Quick general ? From noob. I have a ww and strawberry couple months from seed. Finall got them nice and green and healthy looking w exception that they are a little thin. Is that because they are 2 far away from light and stretching for it. They are about 20" from hps single bulb light.
Thanks

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Possibly, but are you in flower? Hps lights usually go with flower. A MH or Metal Helide is better for veg cycle. Typically they suggest placing the light as close as possible. Use your hand as a reference. If the light is to hot for the top of your hand its to hot for the plant

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Maybe this will help,

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