I bought two of these lights and they fit my Marineland 5G perfectly. However, I did not use the mount. Simply attach the bulbs to the top panel along with a small handle to lift the entire top. I bought a 4 outlet smart surge protector so I can set it up with a timer. The moonlight begins at 6:00 a.m. and goes out at 9:00 a.m. The light day begins at 8:00 a.m. and lasts until 8:00 p.m. The moonlight then returns at 7:00 p.m. and goes out at 9:00 a.m. This worked great for my setup and not too much for my plants at all. Also, I like to have the light in my aquarium when I'm home so I can see it. I will update this in about a month on how well they affect plant growth and seed germination. But for the price I would definitely buy it. PS for the seller, if you are the engineer/designer of this light, just add the built in timer and lighting mode setting to the timer. And they charge $30-40 for it, they'd sell like hotcakes!
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