Looking for a second light fixture. Another viparspectra vs expensive leds vs DIY T5

[Koh23]

Did you take any numbers?

I kinda dobt that blue chanels give more lux than white....

 

[KonradTO]

Did you take any numbers?

I kinda dobt that blue chanels give more lux than white....

Sure. For example at:
- 55%B 1%W (vipar) or 65% 45% (kessil) you get 16 kLUX
- vipar: 100%W 0%B = 19.8 kLUX --> 0%W 100%B=23.3 kLUX
-kessil 100%W 0%B= 24.5 kLUX --> 0%W 100%B 25 kLUX

You can see that with the kessil there is roughly the same output in LUX in the 2 channels. In the vipar probably the green and red diodes produce little light so they make the channel less powerful.

 

[Semisonyx]

Not sure if it really adds to the discussion, but I ran the vipar over my tank for 2 years. The key to these lights is keeping the optics on and running them high off the water for light blending. The optics work well, and even at 14” off the water, I never ran them over about 50%B/25%W. I supplemented with two diy led bars and a pair of t5 bulbs. One thing to consider is internal reflection in the tank. I found this typically helped keep PAR from significantly dropping off with depth in my tank.

 

[oreo54]

Sure. For example at:
- 55%B 1%W (vipar) or 65% 45% (kessil) you get 16 kLUX
- vipar: 100%W 0%B = 19.8 kLUX --> 0%W 100%B=23.3 kLUX
-kessil 100%W 0%B= 24.5 kLUX --> 0%W 100%B 25 kLUX

You can see that with the kessil there is roughly the same output in LUX in the 2 channels. In the vipar probably the green and red diodes produce little light so they make the channel less powerful.

LUX meters are calibrated to human light sensitivity li KK e the curve below.
https://www.daltonengineering.co.uk/products/light-meter-with-light-sensor

Like 250 lux of blue = 1000 lux of green when sensor sensitivity is factored snd converted to par. Meter sensors only "captures" 25% ( in real life likely less than that) of the blue photons vs 100% of the green.

Numbers are fake but the idea is correct.
https://www.waveformlighting.com/horticulture/convert-lux-to-ppfd-online-calculator .
See the extreme example of monochrome blue vs daylight.