13w should be fine. Another option is 23w (they may or may not fit in the fixture). I don't recall if they are full spectrum daylight; just try to get the 6500K.
Ok will do
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13w should be fine. Another option is 23w (they may or may not fit in the fixture). I don't recall if they are full spectrum daylight; just try to get the 6500K.
Please don't exceed recommended wattage of your fixture. Fires are bad
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Good point. In my head I was thinking that the fixture was the utility clamp on meta cone...until I went back one page and realized it is an incandescent hood. *** The maximum wattage should be printed on the fixture. ***
I couldn't find anything other than the 23w 6500K bulbs at Home Depot. Phillips brand, four pack, for $13.
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Full spectrum doesn't guarantee it'll be 6500K. Look on the base of the bulb and it'll tell you the Kelvin rating. The Kelvin rating should also be on the packaging, even if it's labeling is clouded with wattage, lumens, or other random descriptors like "daylight" or "warm/cool light".
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I wouldn't run the blues at all. Plants can't use that rating, but algae can. I'd stick to all 7K. Run it less than 8 hours a day.
Java fern needs to be mounted to a rock or driftwood, not planted (with fishing string or thin cotton string), amazons will need root tabs, anubias can grow with ambient light so nothing complicated there. If the cardinalis is what I think it is, it may not survive in your tank without a bit more light. It may survive just fine, but will most likely lose its red coloring while still needing a decent fertilizer regime.
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If the blue, 7K and 10K are all separate diodes, run all of the 7K and 10K.
Yeah, that cardinalis is going to need more light as it's a high light plant. When it looks its best, it's a deep red.
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It's only a 21w fixture, and some of that is lost to the blue LED's. That fixture doesn't have the greatest PAR, either (light intensity over a distance). There's no lens on the diode, so it's light is dispersed all over. The Kelvin rating is only part of the picture. High light LED fixtures are pushing around 80-100w with great PAR.