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As the plant gets taller, one CFL cannot provide enough >100,000 lux light for the whole plant. Again, at 5" one 1700 cfl gives off 105,400 lux. But at 12", only 18,300 lux. As you move further away from the light source, lux drops very fast. Also, you need to make sure all sides of the plant...

Lumens is a measure of human visible light. Light bulbs are rated in Lumens since that is what most people care about. You really want to know PAR (Photosynthetically active radiation) watts - this is the measure of the light applicable to photosynthesis. PAR ratings for lights cannot really be...

I think you mean 150,000 lux, not "150,000lux per square foot". Wikipedia's article on Daylight (Daylight - Wikipedia, the free encyclopedia) says Brightest sunlight is up to 120,000 lux. Wikipedia's article on Lux (Lux - Wikipedia, the free encyclopedia) says Direct sunlight is up to 130,000...

The sun is a bit further away, to say the least. At one inch, a 1700 Lumen CFL puts out 2,635,000 lux. At four inches, it produces 164,700 lux. At one foot, only 18,000 lux. The sun produces enough lumens to travel 4.9 x 10^11 feet - through the earth's atmosphere - and still provide between...

Drop down to one 1700-Lumen CFL, put it at 4 to 5 inches. Give it a day or two. You should see a good deal of improvement. As the plant gets bigger, you'll need to add more light, of course. Here's some details: You can calculate lux yourself with this formula: lux = lumens / distance ^2...

I believe -- and I've got research and experience to show it -- that people can and frequently do provide too much light with CFLs, especially when the plant is younger. One 1700 lumen CFL at 4 inches provides 164,000 lux. One 1700 lumen CFL at 3 inches provides 292,000 lux. Two 1700 lumen CFLs...

Depends on the damage, but in my experience you will see improvement in a day and new good looking growth by three days. Let me know how it goes, good luck!

The right amount of light matters more than the color of the light. Ideally, you would use the cool blue light in vegetation and the yellower warm lights in flowering. If you are using a light bulb brand like GE, you should be able to google the model number on the bulb to find out temperature...

I don't think so. I'm assuming you room height is 1 meter. I've assumed your bulbs are each 10,000 lumens and they are placed at the top of the room, one foot apart from each other. You need ideally between 100,000 and 120,000 lux throughout the room. I try to avoid anything less than 75,000...

Your 42 Watt at 8" is producing about 68,000 lux. Your 23 watt is producing about 40,000 lux. Exact amount depends on how many lumens they produce. Those two are enough at that distance to keep your plant growing healthily. Direct sunlight is 100,000 to 120,000 lux. More lux than that cannot...

At its current stage, one 1700 lumen CFL four to five inches away.

You've got way too much light on them. I can't tell some details from your post or pictures, but I'll assume: - your 100 watt equivalent bulbs each produce 1700 lumen - your 75 watt equivalent bulbs each produce 1100 lumen - your seedlings are 6" from each bulb If that is the case...

Just to add some detail to Pink Floyd's comment: At 8 inches away from a 1700 lumen light source, it only provides 41 lux, about the same as a very overcast day. At one foot, only 18 lux.

There's no consensus on mixing different temperature CFL lights. For flowering, most people stick with all 6500k, some like to mix in some 2700k. There's more evidence that sticking to all 6500k in flowering produces better results, and more people do this, but no one has done any solid...

so... short answer: leave them at 4 inches. When the plants get big enough, add some around the sides.

From a technical perspective: The bright sunlight is around 100,000 to 120,000 lux (Daylight - Wikipedia, the free encyclopedia) You want to reproduce the plants ideal natural growing environment, so you would aim for this. A 1700 Lumen CFL light will give 164,000 lux at 4 inches. At 5 inches...

All around. Aim for even lighting. Just lighting the top will cause the bottom half (or quarter) of the plant to not get enough, especially for larger plants with CFLs. Probably half of the lights on top, the other half spread out on the sides. Moving the plants or lights every so often (daily...

From Telegraph.co.uk on July 30, 2008: Poor insulation led to drugs raid on police officer's home A police helicopter with infra-red detection led them to raid a house that was owned by another police officer. Turns out it was just an insulation problem, not a grow operation. Certainly makes...

Day 1 [5/30]: Seed Germination Four bagseeds, likely heavy indica, were soaked in pure 3% hydrogen peroxide for around 24 hours. One seed looked like it was about to have its radicle emerge. I have a feeling I could fully germinate in the hydrogen peroxide, skipping the following steps using...

Yeah - likely mold. You may be keeping the things too moist or in an area that is too humid. I grow a lot of vegetables and fruits (not a euphemism) and have this problem a lot when germinating seeds directly soil-based seed trays with a plastic cover. I've never seen this problem...