if you look in my threads you will find alot of into on dual arch tubes. i still use a few of them but would not purchase them again.

i used the hortilux brand. GREAT results just no worth the investment.

in the usa the cheapest bulbs i have found are out of florida. Gulfcoast hydro , or goldcoast check it out. let me dig up a few shots of the bulbs and light spectrum

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