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Grow Lights

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Grow Lights

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Grow Lights

Looking to buy grow lights? You’ve come to the right place. Take your pick from our carefully selected range of hydroponic grow lights.

You don’t have to spend a fortune, you can get quality grow lights for the cost of cheap ones.

All indoor growing lights stocked are CE marked and designed to give you the best results. You can buy complete kits (ballast, reflector & bulb) or create your own, the choice is yours.

Unsure of what lights you need? Here are some of the common questions (and answers!) asked about our indoor plant lights.

Questions and Answers

Do we sell grow light kits or just individual products?

If you’re looking for grow light kits, one of our complete grow lighting systems is probably what you need. They’re made up of:

  • A growing lamp: to emit plant light, also called a grow bulb.
  • A ballast: to regulate how much power goes to your grow lamp.
  • A reflector: to direct light emitted by your growing lamps down to your plants.

You can also buy grow lights as part of a grow tent kit. If you’re looking to buy cheap lights, this is an excellent option. You’ll save money and you’ll be getting a grow tent that suits the intensity and footprint of light emitted by your indoor grow lights.

What wattage is best for plant growing lights?

Your growing lamp’s wattage tells you how intense a light it emits. The intensity of your plant grow lights needs to suit your plants (and what they can cope with), the size of your tent and your overall set-up.

If your lights are too intense for your plants, they could cause damage to the plants leaves. Not intense enough and you will be limiting growth.

If your hydroponic lights are too intense for your tent, you can experience heat problems. If they aren’t intense enough for your tent, your overall yield will be low.

Lower wattage growing lights for plants are good during propagation, and higher wattage hydroponic lights (up to 1000W!) when full size.

What growing light should you use during propagation?

Low power fluorescent growing lamps are best (like our T5 lights). If you don’t want to use fluorescent, T5 lights, you can sometimes get away with placing your propagator in your main grow tent under a main grow light; just make sure your plant grow lights are positioned right at the top of the tent, and your propagator isn’t directly under the light.

What indoor grow lights are best for vegetative growth?

During vegetative growth, plants respond well to blue wavelengths of light. You can use an MH (metal halide) grow light, CDM (Ceramic Discharge Metal Halide) Daylight Lighting System, or dual spectrum HPS light for this.

What plant grow lights should I use for flowering?

Plants will need red wavelengths of light for flowering. You can get this with either an HPS (high pressure sodium) or dual spectrum hydroponic light.

How do cheap grow lights compare to advanced ones?

Cheap grow lights can still be effective. You can get a really decent indoor grow light for less than £100.

Just remember that you get what you pay for. You’ll pay more for it, but with an advanced, Gavita grow light you’ll get bigger, stronger, healthier plants with huge yields.

The question is, how much is the extra yield worth? If it doesn’t matter, use cheap grow lights. If it does, go for Gavita growing lights.

How often should I buy grow lights for plants?

It depends on your indoor grow lights and how quickly they degrade. Remember that every 1% of light lost costs you 1% of your yield. The real time to replace your indoor grow lights is when it’s costing you more in yield not to. Most people should buy replacement lamps or new grow lights for plants every 6 months.

What’s the best way to measure the output of plant growing light?

Before you buy grow lights for plants, you want to find out how much plant usable light they emit. To do that, you need to know a bit about how plants use light.

The light spectrum is made up of lots of different wavelengths. For growth, plants can only use wavelengths of light between 400nm and 700nm. This is known as the PAR range.

Plants needs 8-10 particles of light from the PAR range (photons) to bind one molecule of CO2 during photosynthesis.

To find out how many photons are emitted by your growing lights per second, find out what its photosynthetic photon flux (PPF) is. It’ll give you a micromole reading (µmol/s). Just 1 µmol is equivalent to 602 quadrillion photons!

Does a growing light’s voltage matter?

Yes. The best indoor grow lamps for plants tend to be 400V.

The short of it is that 400V lamps produce more plant usable light (micromoles) than standard 230V growing lamps - the average increase with 400V lamps is 8% more plant light!

What are supplemental grow lamps for plants?

Though plants can only use PAR light for growth, a broader light spectrum can really enhance growth.

UV-A and UV-B emitting indoor grow lights, for instance, are known to boost pest resistance while enhancing the taste, aroma, appearance and medicinal properties of your final yield.

To really broaden your spectrum, you will need supplemental plant grow lights – either a CDM (ceramic discharge metal halide) or LEP (light emitting plasma) will do the trick just nicely.

Do you sell LED grow lights?

We've only recently started selling LED lights! The ones we sell are Grownorthern Telos LED plant lights. They emit so much PAR light that they compete with Top HPS lights.