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The HLG 550 V2 4000K quantum board by Horticulture Lighting Group is a large, white full-spectrum, modern design LED grow light that effectively covers a 4.5 foot by 4.5 foot grow space. Horticulture Lighting Group are the manufacturer that actually came up with the “quantum board” grow light design and started the trend among the indoor plant growing community. Quantum board LED panels are now one of the most popular grow light choices among the experienced growers. This fixture is basically four custom designed full-spectrum high efficiency white light QB288 quantum board panels combined on one fixture. The biggest advantage of the Horticulture Lighting Group quantum boards are the quality components. Chief among them are the Samsung and Osram LEDs and the Meanwell drivers. These high quality components are extremely efficient, delivering a high output, while consuming less power and generating less heat than almost every other light on the market.
The HLG 550 V2 4000K LED grow light utilizes 1,152 LEDs top-bin Samsung LM301B LED spread out evenly among the four circuit boards. Each of the Samsung LM301B LEDs emits a full-spectrum white light with a color temperature of 4000K. That is a slightly cold white (i.e. containing a lot of blue-spectrum light) that is great for vegging, but also works well for flowering. The light emitted by the HLG 550 V2 4000K in principle is ideal for full cycle plant growth, but it is especially powerful for the vegetative stage of your plant's growth cycle. For that reason, you want to go with the 4000K spectrum if you are vegging only. If you are growing full cycle or flowering only, the RSpec version of HLG 550 V2 is your best choice.
If you’re curious, or just switching over from an HPS grow light, Horticulture Lighting Group equates the HLG 550 V2 4000K to a single-ended 1000 watt HID grow light, while it will draw only 480 watts from your wall at maximum power. The Meanwell driver has a rubber stopper on the “Output” side, you can remove the rubber stopper and adjust the light intensity with a Philips screw driver. You can dim the HLG 550 V2 4000K down by 50%, bringing it down to 240 watts of power consumption, which makes this LED grow light even more efficient, when you don’t need the full output!
The HLG 550 V2 4000K doesn’t feature cooling fans or heat sink on the design. That’s because it doesn’t need them. Many commercial growers reported their HLG 550 V2 4000K gives off “barely any heat.” For many of them, an oscillating fan is enough to manage temperatures while using this quantum board LED grow light.
One major advantage of the Quantum Board LED grow lights is the uniform photosynthetic photon flux density (PPFD) that doesn’t fade dramatically when you measure further from the center of the PPFD chart, which is the case for many “regular” LED grow lights. To understand better, let’s look at PPFD charts for the HLG 550 V2 4000K quantum board panels:
As you can see, the coverage is much more even than most LED grow lights. Instead of sky-high PPFD readings in the center of the footprint and minuscule readings in the corners, the difference is not nearly as pronounced. But of course there is still a difference. That is unavoidable.
The reason for the even coverage is the size of the fixture. With a smaller fixture (like most competitors), light to the corners of the coverage area has to travel further, since it is coming from the center of the area. It loses much of its intensity by the time it reaches the canopy. With the larger HLG 550 V2 4000K fixture, light does not have to travel nearly as far to reach the corners of the coverage area, since the large size of the fixture brings LED diodes much closer to the far corners. As a result, the light does not lose nearly as much of its intensity by the time it reaches the canopy.
Quatum Board QB288 Production Video:
Credits: Horticulture Lighting Group
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