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- Newsgroups: bionet.plants
- Path: sparky!uunet!newsstand.cit.cornell.edu!news
- From: Thomas Bjorkman <Thomas_Bjorkman@cornell.edu>
- Subject: Re: Light??
- Message-ID: <1992Nov16.133503.19675@mail.cornell.edu>
- X-Xxdate: Mon, 16 Nov 92 08: 39:06 GMT
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- Organization: Cornell University
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- Date: Mon, 16 Nov 1992 13:35:03 GMT
- Lines: 22
-
- In article <1dpkl1INNq6r@usenet.INS.CWRU.Edu> Kevin Currie,
- ck041@cleveland.Freenet.Edu writes:
- > Will a plant grow off of a regular 100watt light bulb?
- > Or does it need a special "grow" light or sunlight?
-
- While just about any light source will be fine for driving photsynthesis
- (and energy efficiency is worth considering in this regard), what will
- make or break your lighting are the developmental responses to the
- spectrum. Each species has its own preferences, and some are not very
- picky.
-
- Some examples: When grown in straight cool-white fluorescent light,
- radish hypocotyls will elongate. Rather than getting a round radish, you
- get a long red "thread" between the soil surface and the cotyledons. The
- result is a rosette hanging upside-down on the side of the pot.
- In the greenhouse, we use high-intesity lighting to keep the plants happy
- in the winter. Cabbage grows very well under high-pressure sodium
- lights, but beans do not. Beans do fine under metal halide.
- There may be primary data that are useful for predicting these responses,
- but it is often easier just to try it with the plant you want to grow.
- For Mr. Currie, a fluorescent light is probably the best start, adding
- some far-red with an incandescent if the plant is not happy.
-