plant lights vs sunlight

[Todd A Wallace]

I have noticed that when I grow seedlings under my grow light they grow
tall and thin, and eventually topple over. If I grow them next to the
window, they grow stronger but shorter. Why is there a difference?

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|    Todd Wallace               |  "A pessimist is surprised   |
|    twallace at mason1.gmu.edu    |   as often as an optimist,   |
|-------------------------------|   but always pleasantly."    |
| Expatriate Midwesterner (tm)  |            - Robert Heinlein |
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