While both the technical details and experienced intuition are valuable, from what I’ve seen in myself and other people, watching plants in your own garden and elsewhere is the more effective teacher. Start with some reasonable set-up then pay close attention to the plants. Honestly, I wouldn’t worry too awfully much about the fine details. I mention those factors mostly for completeness. In both capital and operation, the heat may be more expensive than the lights but it matters.įor light duration and color, there are multiple relevant replies in Can plants have too much light, or do they need night/rest?. Each 24 plants also had two 17-watt heating pads. Having two bulbs may be important since that way most sides of each plant get reasonable light, especially if you periodically shuffle the pots. Place grow lights close to the leaves, just short of burning them, and adjust as the plant gets taller. To convert a bulb’s lumens to watts you have to know how far from the average leaf the bulb is. On the other hand a pair of 100-W-equivalent tube bulbs (1500 lm) on a timer per ~ 24 half-gallon milk carton pots grew beautiful stocky 15” tall tomato transplants.įor units I recommend you plan in units of watts since that’s what the tomato experiences. The key result was that, perhaps combined with relatively cold air, the tomatoes were leggy, very small, and as seedlings tended to die from damping off. They received ~180 W/m2 overall average, on only one side of the plant at a time. I’ve grown tomato seedlings in spring (figure 12 h/d) near 40o N with only light from a south facing window. Like many plants, tomatoes can cope with a wide range of light intensities and survive. It depends also on how long each day the plants receive the light, somewhat on whether the light shines on all sides of the plant, and to a far lesser degree on the color of the light. The more important reason there is no one answer, though, is that “it depends.” It depends most of all on what you expect of your plants. pdf for Hernandez or Ho, so unless you want to pay rather nutty fees you’ll need to get those from interlibrary loan or something similar. Neither the main list nor either article’s other versions link to a. The Glowacki and Chia references link directly to each full article. If you enter “tomato light requirements” in Google scholar, four articles that look directly relevant pop up. I can’t give you a precise number of lumens for a couple reasons. Your new project sounds like it could be fun and interesting.
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