Marine Light for Tropical Plant Tank? + HEAT Concerns

The first 2 pictures are of the power supply Yes the model numbers are different. But that is not unusual. Many manufacutes change the model numbers periodically due to minor changes in the design. What is really important in power supplies is the input, output, voltages, and the polarity of the power at the connnecter on the end. So if you look at those specifications on the label, the two power supplies are identical.

As to the heat, that is not unusual for 59 watt LED. When electricty flows through a circuit some of the energy is always converted to heat.

The table is the light Par speck and wattages. It is more than bright enough for plants.

However just looking at picture of the LEDs and the discriptions, it uses Violet (purple), Blue, pink (a little red +blue), and cold white LEDs. No UV. This lightis really very heavy on the blue end of the spectrum. Cold White LEDs have almost no red and the Pink LEDs are also week on the red. Blue light won't cause algae. Plants and algae can use all colors of the spectrum for growth but plants do best when substantial levels of red and blue are present. If the plants mainly see blue they will conclude that they in shad and will put all there energy in growing tall in an attempt to get more sun.

I made my own LED light using mainly 3000K lEDs 3000K LEDs don't have as much blue as 5000K lamps and I thought they would have enough red. I was wrong. plants that normally grow only about 2 inches high were growing to 4 -5 inches tall. I added some red LEDs to it and now those plants are the typical 2 inches tall. Adding the red LEDs to my light probably brought the lamp down to 2500K to 2000K. but to me they still looks white.

Many marine lights are heavy on the blue and violet light that corals like. For plant growth a lamp with white LEDs and some read LEDs would be best.
@Bryon, upon closer inspection, I did see a light drop around noon in the Fluval lit tank. It is greatly exaggerated by their graphs, but out of profound respect for you & your circadian
theories, I changed the settings. The SS here are out of order & I hope they make sense,
PS @Bryon. Did you see the
better photo of the mysterious organism observed in my tank? A few more surfaced & I was able to get better images using a macro lens attachment for the iPad (more commonly used in phones). I sent the image & a note to a marine biologist at Woods Hole. I posted his response in the thread: Unidentified organism…..
The most recent photos are algae in my view. Having read the other thread now, I agree with the individual who said the same in post #27 in that thread.

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