This value-priced LED works well for seedlings and vegetating cannabis and can be effective for flowering smaller plants. It burns cool, covers a broad spectrum and will make a good addition to your setup.

Overview

We've been using these lights for over a year and have had success with both the new and classic models. With two fans, they run cool, but remain relatively quiet. They are fairly stylish looking and still get the job done. We recommend them to new and experienced growers alike.

Product:300W LED Full Spectrum Reflector
Manufacturer:Lightimetunnel
Rated Power:300 Watt
Actual Power:~140 Watt
LED Chips:100 count, 45mil 3w led chips
Spectrum Coveragestarstarstarstarstar
Build Qualitystarstarstarstarstar_half
Germination Use:starstarstarstarstar_border
Seedling Use:starstarstarstarstar
Vegetating Use:starstarstarstarstar
Flowering Use:starstarstarstarstar_border
Overall Valuestarstarstarstarstar_half

How powerful are they? How much coverage?

These units contain 100 x 3w chips, for a total of 300 Watts rated power and an actual draw of about 140 watts. The difference the rated vs the actual power used is that the rated power measures the maximum capacity of the LEDs if they burned at their max ratings. Many folks mistakely believe that the rated power number (300W in this case) gives some indication of power in relation to Flourescent or High Pressure Sodium, but this isn't the case.

The real measure of power for any light, and particularly for LED lights, is through the Photosynthetic Active Radiation, or PAR. Rather than a way of measuring intensity of visible light (lumens), PAR gives an indication of the quality and intensity of light that is useful to a plant in photosynthesis.

Height Above CanopyPARCoverage
24" (max)2652.0' X 2.0'(60cm X 60cm)
18" 4531.5' X 1.5'(45cm X 45cm)
12" (min)8451.0' X 1.0'(30cm X 30cm)

Note: The coverage areas provided above are recommendations based on the results of our experimentation with these lights.

How's the light spectrum?

This unit comes with 100 pieces of Epileds 45mil 3w leds to cover a fairly broad spectrum: 430~440nm, 450~460nm, 610~615nm, 620~630nm, 650~660nm, white, IR(730nm) , UV 380~400nm, 470nm. The bottom line is that this light reproduces all of the important spectrums that a plant needs throughout its lifecycle.

Visible ColorWavelengthCountPurpose
Far Red (aka: IR)740nm1Improve efficiency of photosynthesis
Red/Orange630nm78Promotes growth & flowering
Red660nm 8Promotes growth & flowering
Indigo470nm8Vegetative growth
Blue450nm2Vegetative growth
Hyper-Violet (aka: UV)430nm1Strenghten the plant.
Whitemixed2Broad spectrum coverage.

There are some caveats here. The lamp manufacturer reports IR and UV functions, but since UV starts at 400nm, the reported 'UV' is actually just a hyper violet at the very edge of the visible spectrum. While the 'IR' bulb is technically at the edge of the near-infrared range, it would be better described as a far-red light since it is at the extreme edge of the visible range. This is good news though! These are the correct ranges for your plants - further into the IR and IV range can damage your plant. UV-B and UV-C can cause DNA mutations.

How's the build quality?

These lights are basic starter lights, but well constructed with all the features you would expect, including:

  • The Epiled lights come with a 120 degree secondary optical lens to improve penetration
  • 3 heat fans combines with a 'sunflower' radiator system dissipates heat very effectively
  • UL approved, isolated power supply for safety
  • Hanging cable

In addition to these basic features, the 300W unit from Lightimetunnel comes with a few features that you would expect on a more high priced units:

  • Each light has a passthrough outlet that lets you 'daisy chain' up to 5 lights together - this is great for large grow spaces.
  • Metal housing is safer and more durable than plastic housings.
  • 12 month warranty - return it if the quality isn't right for you.

Are they good for germination?

These lights can be a little strong for freshly germinated seedlings. We recommend fluorescent or sunlight for germination, but this light can be used if hung at least 24" (60cm) from the top of the germinating plants.

Are they good for seedlings?

Yes! We use these lights for seedling all the time with great results. Hang the lights 24" (30cm) above the canopy for new seedlings and lower to 18" after the first week or so and you will see explosive growth.

Are they good for vegging?

Yes! These lights are great for vegging. Hang the light 18" above the plants for rapid vegetative growth.

Are they good for flowering?

We have experimented with small/fast auto-flowering and found that this light can be used to produce excellent flowers all by itself. At 12" (30cm) height, these units produce a par value of about 850. For big, fat buds, I prefer a PAR greater than 1000. This is just a general rule of thumb though - we have shown that, for a small grow of a single plant, a single light can be used from start to finish.

We have also used it to subsidize sunlight in the evenings and to fill in dark spaces in the tent.

We grew this Strawberry Cough from start to finish under one of these lights.

The positive and the negatives

We are enthusiastic users of this product, but, just like everything else, it has some downsides. In every product review, we document 3 positives and 3 negatives to add balance.

3 Positives:

  1. The price point for this light is low compared to the quality and service - I've interacted with the company several times and have found them responsive each time.
  2. The light covers a broad spectrum, giving your plant everything it needs
  3. The fans and heatsink are effective and light burns excessively cool

3 Negatives:

  1. While it includes a hanger, you'll quickly find that you need an adjustable one to have height control.
  2. They are effective, but the fans are a little louder than others I've heard.
  3. There isn't much in the way of documentation

Conclusion

If you are looking for a great starter light, this might be the perfect option for you. Learn more about selecting the right lights for your setup and about buying lights online in our grow light guide.

As Reviewed:

This is the 300W LED light reviewed in this article. Click here to view on Amazon for all the stats.

Classic Version:

This 'classic' version of the 300W light is lower priced, but doesn't support daisy chaining. Click here to view on Amazon for all the stats.