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COB Grow Lights gives a 3 year warranty and 60 day money back and if you have a problem with the product they will service it and ship it back to you at no cost. Growthstar COBs actually have a chance to last 10 years unlike other LEDs. The company is constantly testing. IF there is...

I'm using Growthstar chip on board LEDs from COB Grow Lights in Canada.

Wonder how those compare to the ones I'm using now. Wouldn't mind buying some to test.

http://www.cobgrowlights.com/blogs/news/77893445-cob-led-grow-light-review-grow-guide 550W COB LED vs 1000W HPS http://www.cobgrowlights.com/blogs/news/77794757-growthstar-scorpion-cob-grow-light-trial-enters-final-weeks-notes-from-3rd-party-cultivator...

550W COB LED side by side vs 1000W HPS http://www.cobgrowlights.com/blogs/news/77794757-growthstar-scorpion-cob-grow-light-trial-enters-final-weeks-notes-from-3rd-party-cultivator http://www.cobgrowlights.com/blogs/news/77893445-cob-led-grow-light-review-grow-guide Better products cost more...

Yellowing from hot spots maybe? Just a guess. Diagnose sick mj plants http://www.thenug.com/galleries/diagnose-your-sick-marijuana-plants Looks like either a boron deficiency or too much light and getting burnt in those spots. It is common with traditional lights (CFL/MH/HPS). If you get chip...

one of these ones? http://www.ebay.com/sch/i.html?_odkw=hydro+tent&_udhi=50&_mPrRngCbx=1&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR12.TRC2.A0.H0.Xgrow+tent.TRS0&_nkw=grow+tent&_sacat=0

To answer the original question, about 4 plants. Averaging 7 cents per hour total electrical cost. More photos here https://www.facebook.com/growthstar/photos_stream?tab=photos_albums If you want some advice just pm me.

3 week old seedlings under Growthstar 6X which is a 300W actual watt LED multiple chip on board grow light. Facebook Album. https://www.facebook.com/media/set/?set=a.1250249358325623.1073741864.479827185367848&type=3