Resurrecting my own thread. Made the bulb switch. Odd thing I got excited about: the threads on the radium bulb were such that if I had the exhaust tip of the arc in the recommended vertical position, the bulb wouldn't fire because it wasn't screwed in far enough, screw it in further and it reached 100% snug on both pendants with the exhaust tip pointed to the side. The xm10k bulbs tighten down perfectly to where the exhaust tips are vertical.
First comment. Snap these are bright. Tried glancing at them when on and it was like looking at the sun at high noon in the summer. Wow. They're also very white but completely tolerable. I like the look in a different sort of way. I probably prefer the radiums, but the growth I hopefully get from these will be worth it.
Right now I have a double layer of window screen on the tank. I did not change my photoperiod. With the window screen layers, it appears a touch brighter than the uninstructed radiums as you can see in the pics.
Question now...what should my timeline be for removing the screen layers down to one, then none? 2 weeks per adjustment? 4 weeks? I'd rather not shorten the photoperiod if I don't have to, and height of pendants is maxed out at 12" off the water.
Here's a pic with radiums and the BuildMyLED super actinic strip at 100%. Taken a couple months ago
And the same shot from tonight with the XM10k bulbs and BuildMyLED super actinic at 50%
