10/08/2019 1:15 am This 315 LEC is being kept 2.5 feet (75 cm) away from the tops of these young plants until they get bigger. Highly efficient agriculturally engineered CDM-T 315 Watt LEC® brand lamp (lamp included). I have a dimmable smart ballast, but you'll never catch me dimming it.The bulb is designed to provide the correct light spectrum at 315w. Older HID bulbs give off less light and more heat, so in addition to keeping the right distance, make sure you’re aware of the age of your bulbs. Recently, they almost always come in 315W or 630W sizes so they can compete more directly with the branded LECs.Regardless of the name, LEC grow lights are basically a hybrid between Metal Halide and HPS grow lights. I could of course put the led back in and drop it down, or I would prefer to get a dimmable ballast for the 315. CMH fixtures pull low watts (315 Watts), but its output can be compared to a 600-watt HPS. I guess in such a small tent the walls will be very effective also. Anyone got some flower rooms with these in them I can come visit. He started and the light was like 6 feet away. The starting temp on the dual CMH was 76 and increased to 100 degrees. Replies: 5 Views: 14,016. snicklfritzzz Nov 14, 2017. Both the “CMH” grow lights have been around for many years, and used to come in typical HID sizes like 400W, 600W and 1000W. You can buy just the sensor and hook it up to a $12 multi meter and then times the multimeter reading by 5 to get the nm number, or spend $400 on the meter with the built in sensor.Don't bother with a dimmable CMH ballast if it's costing you more. What is the cheapest method for measuring light levels?The Philips bulb can be as close as 18". So the Dual CMH raised the tent by a total of 20 degrees. Although LED, LEC and HPS grow lights can produce the biggest yields and most potent buds of all grow lights, they need to be used correctly to get those results!By positioning grow lights the right distance from your plants, you’ll create the highest levels of light your cannabis plants can use. A 315w CMH really wont cut it in a 4x4 though, you'll get pretty small buds. Some CMH models need to be kept 3 feet away from the tops of plants!LEC bulbs last longer than either MH or HPS grow lights, and only need to be replaced every 6-7 grows.Unlike with MH/HPS/LEC grow lights, there is no “standard” distance to keep each LED grow light and it’s hard to summarize with a quick chart like the others. Philips is a popular manufacturer that sells a variety of bulbs from CFLs, MHs, HPs to CMHs. Always read the instructions or ask the seller. A CMH can cover larger areas, making them the most energy-efficient choice when compared to other gorw lights. Posted : 10/07/2019 7:14 pm mammuth Esteemed Member. 10/09/2019 4:11 pm Copyright © 2020 Coco For Cannabis Inc All Rights Reserved The proper distance varies wildly between models. You'll get more intense light from the bulb tip to the canopy.I used to grow with a cmh and a dimmable ballast, I have a different opinion.Firstly, you hardly can work with a cmh under 12 inch: it's the minimum distance for flowering but you should stay around 18 inch during veg [24 in earyl veg].Dimmable ballast: I've read lots of times about the supposed spectrum changes using lower wattage, WELL, even if it's proved it's one of the fact, as a grower, you need to know and manage. You want to keep grow lights close, because buds More light is better when it comes to yields, but unfortunately that’s only up to a point. This is why it’s beneficial to be able to In general, MH bulbs need to be replaced about once a year (every 2-3 grows), while HPS grow lights last a bit longer, up to 2 years (every 4-5 grows). It all depends on the area you're trying to cover. As a result, the top buds and leaves on that plant got burnt and/or bleached.In addition to the wattage, it’s important to realize thatIf you’re using new bulbs, never start closer than the “~Sunlight” distance on the chart and only move lights closer if your plants are stretching towards the light (getting tall and lanky).If you’re using older MH/HPS bulbs, you should replace them if you can, but if that’s not possible you can keep your bulbs closer to help make sure your plants are still getting good light levels.

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