One star is for incompatibility of normal 120V circuit. A dimmer switch is required or no light! I even try to find a 0-10V dimmer switch and found none with 0-10V in spec sheet. In order to make it to work, 120V AC and 0-10V from a dimmer switch. After relentless searching, I found the direct replacement which requires 120V only. They fit fluorescent tube grid perfect, 2x2ft. They are bright like sunlight. Why do you want to dimmer the light?!https://www.amazon.com/gp/product/B099NGV8KQ/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
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