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does not compare to Sunmaster or Hortilux. i tried these bulbs as a cheap replacement and was very disappointed in the final yield of my indoor fruits and veggies. some people said that if you replace them more often, you would get the same results. do not buy those claims! i have done the legwork and did a comparison. these did not measure up to the Sunmaster bulbs i normally use. stick with Hortilux, Digilux, Ushio or Sunmaster. these have been tested and proven to be excellent bulbs. i have also heard that yieldlab is a good budget bulb but i have not tried them. even the regular HPS GE bulbs have better results than Vivosun. they do have a very nice box but that is all that is good about them. do yourself a favor and spend a few extra $$$ and get 50% more flowers.
Verified purchase: Yes | Condition: New
It's bright, both bulbs work. I don't know for how long. It was a good price and I have high hopes. 600 watts of hopes and dreams with a spare! Unfortunately both bulbs burned out within one month. One didn't last one day. These bulbs are garbage, don't waste your money.
Verified purchase: Yes | Condition: New
Great light spectrum and results. Grew squash twice as fast and furious as regular parking lot metal halide
Verified purchase: Yes | Condition: New
This was a replacement , I had 2, one lasted one failed on first use but they cost about half compared to competitors.
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New