Mix Different Color Bulbs Together Best suited to Any Stage of Life. “Will a 5500k or 5000k photography CFL bulbs work for growing weed? I know you’re supposed to get 6500k colored bulbs in the vegetative stage, and 2700k colored bulbs for flowering…” “I have a 150w 5500k photography bulb which looks identical to other bulbs rated 5500k specifically sold as ‘grow bulbs’ so could this be used for growing marijuana?” Any CFL will work for growing marijuana. Again, it’s much more important to get a high wattage than the right color spectrum.
I’ve used 5500k photography CFL bulbs in the past and they worked well. As far as spectrum is concerned, blue (6500k) encourages shorter vegetative growth, red/yellow (2700K) encourages longer/taller vegetative growth and flowering/bud development. However, I’ve found they can all be used successfully in all stages of growing. What has a greater effect on your results is how much light (wattage) in total. For example, I’d rather have 150W of 5500k bulbs than 100W of 2700k bulbs for flowering. The increased light intensity will help your yields more than getting the exact right color spectrum. The increased wattage will give you more return on yields than getting the proper spectrum, so choose the cheapest CFLs you can get that will give you the most wattage! This is what you use to get light to your bulbs from the wall. A common method for setting up CFLs is to use a 2-way or 4-way splitter plus a light socket extender to fit more bulbs into a clamp light socket (without the extender, they might not all fit inside the reflector).
Right – two CFLs on a 2-way splitter on an extender. As a bonus to doubling up, setting up more than one bulb per socket can often be cheaper than buying an individual light socket for each light, especially if you buy online. It also is really convenient for arranging CFL bulbs around your plant. Over the years I’ve seen many creative solutions for setting up CFLs above cannabis plants indoors! A large part of using CFLs is improvising ways to get them in a proper position close to your plants! Light splitters like the following are a helpful way to get more CFLs in a smaller place. They also help you use less total light sockets which can save you some money. Environment & Reflection – reflect light at your plants for bigger yields. Use the power of reflection to minimize light loss in your marijuana grow space. Cover your walls with something reflective like flat white latex paint (which has 85-95% reflectivity) and/or utilize reflectors to aim more light where you want. Make walls of grow space more reflective to get more light to your plants. A common way to quickly add a lot of reflectivity is to paint walls with flat white latex paint – simply painting your walls with this specific type of paint is really cheap but effective! Use reflectors (or make your own like WasabiMayo does below!) Learn more about increasing your yields with reflectivity. If you don’t have a good growing space, you can easily buy one that’s perfect for growing cannabis with great reflectivity! A 2.5’x1.5’x3′ grow tent is great for small spaces when growing cannabis with CFLs. If you have more space, a larger grow tent model will give you a lot more flexibility as far as accessing your plants and being able to arrange your lights. These grow tents are optimized to be as reflective as possible, which increases your yields with the same grow lights. This grow tent is 2’ x 4’ x 5’, which is a good starting tent size that can be upgraded with bigger grow lights later. The inside walls of a grow tent are specially made to reflect the light from grow lights onto your plants. (choose whether you plan to grow in soil, coco coir, hydro, etc) If you’re not sure, I recommend starting with coco coir since I believe it’s one of the easiest and most forgiving ways to grow marijuana. It’s how I got started and I think it’s the perfect way to learn how to grow cannabis without spending a lot of money. Feel free to read my complete guide to growing cannabis in coco coir with CFLs! Soil Hydro will give you faster growth and bigger yields, and it’s actually not as hard as people make it out to be. If you’re not sure, a simple but effective nutrient system is from Dyna-Gro .
It works great for growing cannabis yet it’s cheaper than most cannabis nutrients. You will need to get a bottle of both Grow & Bloom. “Grow” is used during the vegetative stage, and “Bloom” is used in the flowering stage. Dyna-Gro can be used at half-strength (compared to what it says on the bottle) to grow cannabis in soil, water, coco coir, or any growing medium.
When growing in coco coir, I personally use the General Hydroponics Flora trio plus Calimagic (a Cal-Mag supplement) at half strength. Dyna-Gro Grow & Bloom cannabis nutrients work great for growing marijuana. Use “Foliage Pro” for the vegetative stage and “Bloom” for the flowering stage (use at half strength compared to what it says on the bottle). The two-part nutrient system works great for growing cannabis in any grow medium! You should get either a pH test kit with drops or a pH Pen before you start growing cannabis – it’s important to test pH in order to avoid getting nutrient deficiencies Soil: Maintain 6.0 – 7.0 pH Hydroponics: Maintain 5.5 – 6.5 pH.