That is a standard 42W CFL.
Adding this to your grow wont help.
You would be better off burning your HPS for your plant growth.
They produce roughly the same spectrum, only HPS cranks the lumens out far more efficeintly.
If you can find the CFL with 'bright white light...not warm....." you would be better off.
Either way, like NovAss says, you need more of them.
For a 42W bulb, you will want to have at least 6 of them for veggin one plant.
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