They should be placed in a sunny window away from cold drafts. I have heard reports that the fungicides Daconil and Consan 20 can cause reduced germination rates, and are not recommended. I have heard a recommendation for the brand name Chinosal, but have not used it personally. Plants do much better if the day length is kept more or less constant, depending of course on the season. Be sure and use a timer set to 12 - 18 hours a day.
Most plants grow best if the light, dark period matches that of their native habitats.
When using artificial lights, be sure and use reflectors to catch and concentrate as much light as you can on the individual plants. For maximum growth, your plants should be rotated about every two weeks to assure even illumination. This is usually towards the blue and red parts of the spectrum. For best results use a grow light type of tube for fluorescent lights, or for killer results, step up to a metal halide. These kind of lights produce more light in the colors that the plant can use.