If you want to start with all blue and end with all blue, you must turn the blue channel (channel 1) ON at the desired time BEFORE white (channel 2) starts and at the time of your choice AFTER white ends. It also gives you blue lights while the white ones are on during the day. For example, I turned on ch1 (blue) from 10am (10am) to 9pm (9am). My ch2 (white) runs from 11:00 (11:00) to 20:00 (2000). So my ALL Blues runs an hour before and an hour after. It took me a while to figure out how to do it this way and it's not explained in the manual. Stunning and powerful light. My 50 gallons have only been cycling for 2 weeks so I'm currently at 30% blue and 20% white intensity. I wasn't planning on drilling anything into my ceiling, so I used the Brightsky 24 aquarium pendant mount I bought here at Revain. It is sold in various lengths and is ideal for this lamp.
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