lighting

Can somebody explain the watts/sqft number people are using on these forums? Or point me in the right direction for the answer? I see many people saying 35-40 watts/sqft is optimal, but what's the math/science behind that? Wouldn't something like that only be reliable if you are standardizing...

Hello, First let me say a huge thank you to everyone who posts here for the wealth of valuable information they share. You guys and gals have an awesome community. I specifically want to thank @SupraSPL and @alesh, as their previous posts have provided me with tons of useful information...

Question - I want to set up two 1k lights with external pass through air in a sealed room, air from outside passing through the lights, back to the outside, but have those external vents shut off and have the air circulate internally if the room temp is low, so that I am not wasting light...

This is my 2nd grow, I will be growing in a 2.5 x 2.5 x 5.5 tent, 3 gallon pots with pro mix HP...I will be growing NYC diesel auto's (4 plants) and I have been searching all over for feeding schedule with the fox farms trio. I would like to know if anybody has a detailed feeding schedule for...

1. Should an amateur with no wiring experience be building an LED grow light? (former cell phone/laptop/PC tech, so not a dummy, just not experienced with this) 2. Are there people here willing to buy, build, and sell to me? (legal grow) 3. Are there pre-made systems right now that are...

I've been on a role with embarrassing questions this week, so one more shouldn't hurt. From what I can see, this plasma light is supposed to be used in conjunction with a HID, right? Unless I'm mistaken, it covers the spectrums that the HID cannot. It appears that there is a HPS supplemental...

So i've started another grow and this time opting for less plants bigger pots. The pits are 15 liter and i have 15 cuttings. My tent is 1.2 x 2.4 x 2 there about 6"intake and extractor with carbon filter. 4 x 6" osculating fans. Upon potting the cuttings in Terra soil from B&Q i had only 1 x...

Hi guys, I'm going to be using cfl's for a small grow(1 plant) could I get away with using 2700k cfl's for veg and flower as I'm finding it difficult to get any cool white bulbs where I'm at. cheers.

I recently performed a lighting experiment with some Dianthus, slowly bringing up light intensity over a 20-minute period of time at the beginning of the 18-hour cycle and then decreasing the intensity slowly over another 20-minute period of time, just before the 6-hour night cycle. The results...

First post I've made here. Something has been puzzling me recently. Particularly regarding grow lights. I've always used a 600w magnetic ballast and dual spectrum before moving to a mh/hps setup. All were shop bought grow lights, powerplant Sylvania, etc etc. Now to my query. I've recently...

so having a debate right now my husband is scared to switch over to the led but i think it would be a lot better cooler and save money..... what do you all think?

I'm currently growing in a 3'x3'x7'11" tent. My primary light is a 315W CMH. I plan on growing them as wide and tall as possible to maximize my space. I recall reading that with some lights, such as mine, it only penetrates the top 3 feet of the canopy, with the rest of the plant going to waste...

Thanks for taking your time to read this! I am a second time grower and wanting to take my cultivation skills to the next level! I have an open closet that I've decided I will turn to a grow room! Dimensions are 5'x2'x7' The graphics I have included are to exact scale of room and pots. My main...

My plan is to get a clone cycle going with my outdoor greenhouse. Currently I'm cloning inside transplanting to solo cups and then I want to get them in my greenhouse to grow out to teen size to donate to those in need. I live in Oregon and the summer solstice just passed, I have 2 questions for...

For a while now Ive used T5 fixtures for veg growth. They are effective and efficient. But some strains seem to never really harden up or build enough vigor to maximize their potential. Using the T5 fixtures were cheap and easy to use. They produce low heat and can be set up with multiple...

So I want to start a 3 light cycle with 3 rooms open to me each at 10'x12' with those lights scroging 2-4 plants at a time. How should I set them up?

So I came across this (https://en.wikipedia.org/wiki/Liter_of_Light) a while ago and just found it again and was wondering if anyone had tested its actual effect on the quality of light that comes out at the other end. I feel like this could be used to focus the light of a large amount of LED's...

Good afternoon. I am using a grow box for stealth. Everything I have read says to put CFL bulbs close to the plants. 1-2 inches. In my boxes the walls are covered in reflective material. Here is the question... Do the bulbs still have to be that close? I moved them based on what I read and the...

Hey all, I've been doing research on which full spectrum LED light to go with. Doesn't anybody have any first hand knowledge they would be willing to share and explain please ? I'm only looking to grow 1-4 plants tops, for personal use. Please help, any guidance would be greatly appreciated...

Hi, I've just purchased two 65w Sylvania spot gro lights for indoor interior with 2000 hours, I'm not sure how many lumens it has or If thats even enough for a single plant. Will those two bulbs be sufficient enough for 1-2 plants, if not what else would you recommend?