400 watt grow light bulb Mass Metal Halide 400 Watt Bulb – MASS Hydroponics
SKU: 35237980179
400 watt grow light bulb

400 watt grow light bulb Mass Metal Halide 400 Watt Bulb – MASS Hydroponics

Sale price$22.01 Regular price$24.46
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Ships within 48 hours · Estimated delivery Jun 28 - Jul 3

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Description

400 watt grow light bulb Mass Metal Halide 400 Watt Bulb – MASS HydroponicsMass Metal HalideBring the spectrum of the sun indoors! Mass Metal Halide is your full spectrum light source for highest quality flowering (and full growth cycle) indoors! One of the most powerful MH bulbs ever, with brighter output and a superior light spectrum. Designed to bring out the best in your plants during the flower cycle, increasing quality and even yield in many varieties! Its a myth that you need HPS for flower, and our MH bulb will show

Mass Metal Halide

Bring the spectrum of the sun indoors!

Mass Metal Halide is your full spectrum light source for highest quality flowering (and full growth cycle) indoors! One of the most powerful MH bulbs ever, with brighter output and a superior light spectrum. Designed to bring out the best in your plants during the flower cycle, increasing quality and even yield in many varieties! It’s a myth that you need HPS for flower, and our MH bulb will show you! Our bright white light is very similar to natural sunlight and has been shown to produce cannabinoids and terpenes that other indoor light sources don’t produce. Many growers notice huge improvements compared to LEDs, We have much better full range UV and IR, and a great color balance of efficient visible light. It’s easier to keep plants healthy with our light spectrum under a wider range of temperatures, so you can relax and enjoy your garden. The quality of flowers produced under Metal Halide is so incredible that I wanted to keep this technology going and try to deliver the best bulb possible!

For flowering, a 400w can cover up to a 3x3, 600w can cover up to 4x4 and a 1000w can cover up to a 5x5. For vegging, they can cover even larger areas.

To use our light, you’ll need a ballast and a hood/reflector. The ballast wattage must be matched to your bulb wattage, do NOT dim a metal halide bulb, even if your ballast has a dimming option. Please purchase the appropriate wattage for your space. We recommend the use of a PAR meter to get the exact proper light levels throughout your garden, as each reflector spreads light differently. The use of a PAR Meter is essential for large yields under MH. A rough estimate is 14-18 inches away from 600w and 24-30 inches away from 1000w. With air cooled hoods you can also get even closer! Our bulb is Enclosed Rated, so we recommend the iPower air cooled or cool tube hoods which can be connected directly to your exhaust duct. We recommend the Quantum ballast, which is available in both 600 and 1000 watts.

Please follow all safety precautions on the box and on our website. Our bulb is very safe when used properly! When installing, wear a clean glove: do not touch the bulb with your fingers, wipe clean with dry cloth if you do! Avoid spraying any liquids near the bulb. Oils from your fingers or liquids from sprays can heat up and explode the glass, so keep it clean. Enclosed hoods provide additional protection.

We have a website full of information to help you understand our light on a deeper level, and get the best out of your grow on your very first round! Take some time to read our site, and have a great grow! www.massmetalhalide.com

To see which equipment to use with your bulb, visit massmetalhalide.com/equipment to learn about hoods, ballasts, and compatability

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 35237980179

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Starr Charles
Whiting, US
★★★★★ 5
These hold up very well
Color: White, Size: Standard (Pack of 2)
I have NO luck with pillows. I’ve been in stores & tried them. They seemed ok there. At home, nope. I’ve been getting headaches & neck aches from lousy pillows. I’ll change one, a few nights relief. It doesn’t help that I’m prone to headaches. After reading about different pillows, I settled on these. The reviews were better than so many different ones I was looking at. Including high priced & brand names. I bought the standard size. When I saw, “Customers Usually Keep This”, I kept my fingers crossed. When I received them, I took one out of the package & put my head on it & thought, oh no! This is too hard! I tried it again. Ok….. I slept on it & haven’t had any pains since. It’s soft but firm enough to keep my head from sinking & messing up my neck. I don’t move. No more flipping my pillow over. My head doesn’t go below my neck anymore! This has been 2 months now, but it hasn’t changed at all. I wake up happy, not complaining. No more pains or headaches. This saved me from losing days with a heating pad or an ice pack. The price was excellent for 2 pillows. I can’t believe a blind buy was the answer! These are incredible. Finally, something worked for me.
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Reviewed in the United States on May 13, 2026
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Xander King
Port Orchard, US
★★★★★ 5
Awesome Pillows!
Color: White, Size: King (Pack of 2)
These pillows are super soft! I love them. I bought them when I caught a bad cold and needed to prop myself up. Worked so great! Definitely give these pillows a try. They're very reasonably priced too.
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Reviewed in the United States on May 29, 2026
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Sheila Sullivan
Battle Creek, US
★★★★★ 5
Great pillows
Size: King - 20"*34" (pack of 2), Color: Grey
Very luxurious and comfortable! Exactly as described and priced well.
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Reviewed in the United States on May 18, 2026
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Spice Girl
Grantham, US
★★★★★ 5
Perfect Stylish Comfy Queen Size Pillows
Size: Queen - 20"*30" (pack of 2), Color: Grey
These two pillows replaced some very old pillows. They are perfect size for my son’s double bed. They come rolled up and when I removed the plastic they puffed right up to their puffy pillowy size. They are extremely comfortable and my son loves them. They are a down alternative and work perfect for him as he is a stomach sleeper. They have just the right support for a restful nights sleep. They have a nice stylish look 👀. They keep their fluffiness even after sleeping on them overnight. They can be washed in cold water and tumbled dry on low heat. They are the perfect pillows for our family. Extremely happy with our purchase. I highly recommend them. ⭐️⭐️⭐️⭐️⭐️
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Reviewed in the United States on April 17, 2026
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Ginger Council
Houston, US
★★★★★ 5
They have great quality
Size: King - 20"*34" (pack of 2), Color: Black
The pillows have comfort to your head they are firm glad I gotten them
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Reviewed in the United States on May 12, 2026

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