Before I bought Sunpark I bought Ballast from Home Depot. It was a magnetic ballast, not an electronic ballast. It was terrible. It was noisy and the light wasn't that bright; so i returned it. I ordered this Sunpark from Revain which was a damaged original. It arrived quickly, was easy to install as I had practice, and worked just like the original. Very satisfied. Judging by the translation these ballasts usually last 4-5 years - mine lasted 8 years. I will order again if this one goes bad.