Keeping CFLs close results in the best yields and growth
3 Main Classes of Marijuana Grow Lights
1.) Fluorescent Grow Lights
CFL grow lights are the twisty-looking bulbs you can find anywhere you normally buy light bulbs. They produce a great spectrum for growing cannabis and can be used in tiny spaces where no other grow light would fit such as the inside of a cabinet.
Training plants to grow very short will produce the best yields with T5 grow lights
A few years ago, growers usually only used fluorescent tube lighting as a supplemental light for cannabis plants, or for young seedlings and clones only.
In general, I recommend changing to stronger grow lights like LEDs or HIDs for the flowering stage because they will usually give you double or more yields/watt of electricity. Unless you keep your plants very small, they will need more light to produce buds than a fluorescent light can usually produce. If you're in a dire situation where your plants have grown too big and you can't afford to get a different type of light, you can supplement your fluorescent tubes with additional light, for example you could supplement their light with a few CFL(compact fluorescent light) bulbs wherever you notice any "shadowy" areas. This is only a minor fix – the real fix is to grow very short plants or upgrade to a bigger light for the flowering stage.
T5 grow lights should be kept as close as possible without burning your plants.
Growers who have complex lighting set-ups using multiple lighting types often use fluorescent bulbs during the sprouting stage. Young plants respond well to these bulbs, but older plants sometimes require something more powerful. Sadly, you may get lower yields than if you used LEDs at a later stage.
Other Types of Lights
Here are WayofLeaf’s top picks for fluorescent grow lamps. These should suit all budgets and grow spaces, no matter what you need.
2. Apollo Horticulture 250-Watt CFL Compact Fluorescent Grow Light Bulb System – 6400K
Fluorescent Lamp Pros