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Any tube type fluorescent is going to be more efficient than a spiral type. The spirals lose between 1/2 to 3/4 of their light due to restrike regardless of reflector whereas a tube will lose from none to 1/2 depend on reflector design.
In addition the screw in bulbs aren't as efficient in giving photosynthetically active radiation as a plant growth tube bulb.
The X watt equivalent is X incandescent watts.
In addition the screw in bulbs aren't as efficient in giving photosynthetically active radiation as a plant growth tube bulb.
The X watt equivalent is X incandescent watts.