skip the Mylar ... paint the walls with flat white paint :thumbsup: ... reflects almost as well, and Mylar dulls badly with time, anyway ... pain in the ass to keep clean, too :wtf: ... if using fluorescents, and you have the room (you do), go with the 48" tubes ... GE 'cool white' for vegetation, GE 'kitchen& bath' for flowering ... the more, the merrier ... keep them within 2 inches when seedlings, then maintain one inch clearance, after that ... that's why high-pressure lamps are best, flourescents can't penetrate the canopy ... maintain constant oscillating fan airflow, throughout the grow ... keep temps as close to 75f, as possible ... (you can't have enough light, or ventilation ) ... good luck ... :smokin: