1. Jade Ross, Kim Krebs, Geoffrey Gilmore, Kate Gester

2.  How would different types of artificial light affect the growth rate of plants?  Refined: how do different types of artificial light affect photosynthetic rates (measured in oxygen production)?

3.  Plants grow best under a full spectrum of visible light  Typical artificial lights are biased towards one side of the visible spectrum or the other  Incandescent (regular and halogen) bulbs are biased towards the red portion  Fluorescent bulbs are biased towards the blue portion  Natural growth lights are specially designed to emulate a large portion of the spectrum  Included one plant not exposed to light as control

4. Works by passing electricity through Tungsten filament Glass bulb to protect, filled with Biased toward red

5. Subsection of Incandescent Bulbs Works in a similar manner Inert Gas+ Halogen Gas – Halogen cycle Re-deposits Tungsten back on to filament - constant light output (higher color temperature) Light is focused – mirrors Produces much more heat

6. The electricity heats mercury vapor UV excites phosphor, produces visible light Usually uses less energy Biased towards the blue end of the spectrum

7.  2 leaves from a tree  Place leaves inside bottle with O 2 sensor  Place bottles inside 4 same-size cardboard boxes  Thread sensor cable through small hole in back  Create hole from which to hang light bulb  Seal up box with tape so no light will get in

12.  Did not find the species of the plant  Equipment could have been faulty  Forgot to control for heat variable (halogen)  Lack of experience with equipment

13.  We can not say anything about our hypothesis, whether or it is proven or disproven  Underestimated how complex photosynthesis and plants’ needs are  Insufficient repetitions