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
Save 10%

Pay in installments of $6.12 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 30 - Aug 4

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

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

Discover Niche Categories That Outsell 400 watt grow light bulb

Top-Converting Item to Boost Your Average Order

4.0 ★★★★★
Based on 15 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
M
Verified Purchase
Marco L.
New York, US
★★★★★ 5
Best replacement option for 2025 Tesla Model Y Performance
Size: Combo Pack (26" & 20"), Style: Top Lock Narrow, Size: Combo Pack (26" & 20"), Style: Top Lock Narrow
Outstanding replacement option for 2025 Tesla Model Y Performance (Pre-Juniper), so much smoother than the OEM wipers. Very easy to replace. They seem very durable after testing on all wiper settings. Definitely keep the windshield clearer without streaks. Seem to also have more stability on mounting compared to OEM option. 15/10 replacement for the cost, can’t beat it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 13, 2026
M
Verified Purchase
mfair
West Palm Beach, US
★★★★★ 5
Great replacement set of wiper blades for 2024 CR-V! Work great & easy replacement!
Size: 24"+19"+10"(Top Lock)
Excellent wiper blade set for my 2024 Honda CR-V - a perfect fit! Easy to replace the front blades and these are very quiet and do a great job with no streaking at all. Instructions included for the front blades are good. Either lost or couldn't find the rear window instructions, so went on YT for a quick video (for removing the old blade - installation is super easy) and it was an easy replacement. Replaced OEM blades, and these are every bit as good and the price is good. Old blades lasted a couple years, don't think I'll wait that long this time - these are nice blades and easy to replace and worth replacing every year. Very smooth, no streaking, quiet... in short they work great! Recommend for your CR-V - per above they're as good or better than OEM blades. New year with new wiper blades!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 29, 2025
R
Verified Purchase
robert johnson
Waukegan, US
★★★★★ 5
Easy installation
Size: 26"+16"(Top Lock)
Perfect fit and just in time. Went to 4 places and no one has this style. As good as the dealer and a third of the price. Very happy
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
R
Verified Purchase
Retired Appliance Dude
Fort Morgan, US
★★★★★ 5
Much higher quality then I ever expected at a great price
Size: 26"+17"+14"B(U/J Hook)
Perfect fit on my 2023 Mazda 3, they look and install exactly like the original OEM wipers but Mazda 3 can be a little tricky to install but if you search on the internet you will find plenty of helpful videos. They work really well without streaking or noise.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 10, 2026
A
Verified Purchase
Amazon Customer
Lowell, US
★★★★★ 5
Excellent front wipers, rear slightly shorter than expected
Size: 22"+21"+11"(U/J Hook), Size: 22"+21"+11"(U/J Hook)
I purchased the 22", 21", and 11" windshield wiper blade set for my 2017 Jeep Grand Cherokee. The front windshield wipers (22" and 21") work perfectly—smooth, quiet, and they clean the glass very well with no streaks. Regarding the rear wiper (11"), it does work properly and gets the job done. However, it is slightly shorter than the one I previously had installed. To be fair, I did not measure my old rear wiper, but it appears the one on my vehicle was a 12" blade, even though this listing specifies 11". Overall, I’m satisfied with the performance, especially for the front wipers. Just keep in mind that the rear blade may be shorter than what you currently have installed, depending on your setup.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 10, 2026

recommand products