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light bulbs for growing weed

Lights have fixtures and bulbs, and some require a ballast. Depending on the type and model, the bulbs or the fixtures can be more expensive. There are a lot of abbreviations, but don’t be alarmed.

LEDs (light emitting diodes) are relatively new to the cannabis growing world, compared to HPSs, MHs, and CFLs, but they are quickly proving to be the way of the future. LEDs may be more expensive to buy initially, but they are far more efficient and kinder to the environment and your electricity bill. Some cities even give tax breaks to commercial growers who install or switch to LEDs because they’re better for the environment.


These HID bulbs usually contain sodium, mercury, and xenon, and produce a yellow/orange light, and are commonly used for flowering plants. Some growers will start plants under MH bulbs and switch them to HPSs when plants go into the flowering stage, using the same hood. These lights also require a ballast.

How big a light you need will depend on the number of plants you plan on growing, but also on the size of your space. If you’re growing in a closet or a small grow tent, you’ll only be able to fit one small light in there. If you have a wide open basement, you could invest in a bigger light as opposed to two smaller ones.

Best CFL grow light brands

LEDs also typically run a lot cooler than HIDs, so you may not need extra equipment to cool down your grow space, and one LED can usually be used for both vegetative and flowering growth. Some high-end LEDs allow you to change the spectrum for each growth stage.

Light bulbs for growing weed

This superior energy-efficiency doesn’t come at the cost of light intensity since the Advanced Platinum LED light also boasts of having one of the highest PAR (Photosynthetic Active Radiation) on the market. It’s also broad-spectrum (since it’s LED) which means less work for you.

The Sunblaster compact fluorescent grow light is one of the best in its class. It can be affordable, too. In fact, the four-pack provides a great value for those sticking to a budget.


As you can see, picking the best lights for growing weed is more than simply selecting the priciest model available. Especially if you are growing photoperiod plants, you should think about how many plants you are growing, where you will be growing them, and how much energy you can afford to spend.

1. Roleadro LED Panel

Vivavolt T5 lights also cost less than LEDs, but LEDs last significantly longer.

Light bulbs for growing weed

Sylvania Grolux Mixed Bulb:

Types of Bulbs for Indoor Cannabis Grows; today we’re going to talk about the different classes and types of bulbs that you can get on the market, what each one is for and how efficient they are (we tried them all on our own plants). If you’re not sure what bulb to use or if you want to know why certain bulbs are twice the price of others, take a look at this article and you’ll understand.

These bulbs are different when used for flowering however, they have a slight yellow color to them, although personally I don’t think they’re powerful enough for a healthy flowering period but you can use them like we said before, as a supplement for a hotter lamp. Some people don’t have any other options as their grows tend to heat up too much, so they use these bulbs and have to wait a couple more weeks as well as getting a lower yield.

Energy-efficient bulbs:

This nice blue-white light will have your plants basking in the spring sun; the plants will grow nice and compact as this kind of light won’t induce them to flower or to even contemplate it. This light is another MH bulb and it can only be used in the growth period; it’s perfect for mother plants from which you want to get various clones every now and then as this light will help it sprout many new branches and they won’t stretch out too far. With this bulb, the most intense and penetrating light can reach even the lowest leaves. Available in 250w, 400w and 1000w. Strangely, there’s no 600w model available.

Metal-halide bulbs that have a powerful white light which will make your plants grow as compact as they possibly can. If you use this bulb your plants will have short, strong branches that will be more than ready for flowering. When you’re growing in small spaces, the ideal thing is to use these kinds of lights as they will make your plants stretch a lot less than mixed lights. They also let off a lot of heat, so don’t let your plants get too close to the bulb and keep an eye on the temperature with a thermos hygrometer; place it at the top of the closest plant to the bulb and make sure the temperature is not over 25ºC. If it is you can move the bulb further away, they will still grow nice and strong. If you need to move it over a meter away from your plants you might have ventilation issues in your grow. Available in 250w, 400w and 600w.

Discharge lamps also have mixed lights, which can be used for both growth and flowering stages. These kinds of lights are the most common ones found in indoor beginner crops.

Discharge Lamps:

This is the most used bulb here in Spain thanks to its price; it’s one of the cheapest ones on the market right now. You can get a decent yield with these bulbs, and they give off a decent luminosity, although after a couple of harvests the intensity of the bulb tends to decrease quite rapidly. You can’t see it with the naked eye, but if you have a light meter you’ll be able to tell. Almost everyone’s first bulb was the Argolite Gro & Flo. It’s a good idea if you have no other choice, but for just a little extra money you can get much better lights. Available in 100W, 250W, 400W, 600W and 1000W.

We recommend 250w for 80x80cm, 400w for 1x1m, and 600w for 1.2×1.2 at about 3m off the ground; these bulbs are extremely powerful.