wrote:

Apparently the relevant information about this unit is that it is a 800
Watt UV Tanning Lamp.

Would this be a good source of light for some plants that I'm growing
from seeds? Are there cheaper (less than 400 dollars with tax
included) and/or better sources that I should look at?

No, plants are subject to sunburn as well as humans. Get HID lamp,
either metal halide or high pressure sodium. You can get bulbs in a
variety of spectrums for special needs, look at
http://www.altgarden.com/index.html for some more info and products.

A UV tanning lamp is a no-no.