The Effects of Artificial Light on the Photosynthesis Rate · Halogen Light Bulb Subsection of...
Transcript of The Effects of Artificial Light on the Photosynthesis Rate · Halogen Light Bulb Subsection of...
PHOTOSYNTHESIS: PHOTOSYNTHESIS: THE EFFECTS OF THE EFFECTS OF
ARTIFICIAL LIGHTING ON ARTIFICIAL LIGHTING ON OXYGEN PRODUCTION OXYGEN PRODUCTION
Jade Ross, Kim Krebs, Geoffrey Gilmore, Kate Gester
The QuestionThe Question
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)?
The ResearchThe Research
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
Incandescent Light BulbIncandescent Light BulbWorks b y p a s s in g e le c t ric ity th rou g h Tu n g s te n fila m e n tGla s s b u lb to p ro te c t , fille d with Bia s e d towa rd re d
Halogen Light BulbHalogen Light Bulb
Su b s e ct ion of In ca n d e s ce n t Bu lb sWorks in a s im ila r m a n n e r
In e rt Ga s + Ha log e n Ga s – Ha log e n cycle
Re -d e p os it s Tu n g s te n b a ck on to fila m e n t - con s ta n t lig h t ou tp u t (h ig h e r co lor t e m p e ra tu re )
Lig h t is focu s e d – m irrorsProd u ce s m u ch m ore h e a t
Fluorescent Light BulbFluorescent Light Bulb
Th e e le c t ric ity h e a ts m e rcu ry va p or
UV e xcit e s p h os p h or, p rod u ce s vis ib le lig h t
Us u a lly u s e s le s s e n e rg yBia s e d towa rd s th e b lu e e n d of th e s p e ct ru m
Set-UpSet-Up
2 leaves from a tree Place leaves inside bottle with O2 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
ErrorsErrors
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