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Light bulb used to help grow plants in winter?

Posted by Milly in Engineering on 12 19th, 2008
winter plants
scienceguy asked:

Hello,
I have to design a light bulb for a project. The light bulb needs to be a source of light that will help plants grow. The light bulb should fit in a regualr light bulb fixture. The main purpose of this light bulb is to be used during winters indoor to help grow plants. The bulb must waste the least possible amount of energy.
How would you design it?
What kind of light would the light bulb emit?
How will you prevent wasting electricity?
ALL pesponses are greatly apprectiated.