Following, looks promising. Thanks Dana
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After some investigation, it turned out that this was being caused because there is an effect where the interface between water and glass, and then the interface between glass and air, both reflect a notable amount of light back into the tank. By painting the back, you lose that glass to air reflection effect and this can cause a measurable drop in light level in the tank. I'm paraphrasing all of this based on a presentation he gave at a local club meeting a while back. Not sure where a specific and more detailed write up could be found, and also not sure what the name of that reflection effect is, but it does have a name..
Thanks. I can test this in another tank. In the meantime, PPFD at 1 pm is 272. Maximum intensity, per this program, is at 2 pm.FYI, painting glass (any color) will cut down on PPFD...
I've had the same issues. I'll PM Randy.for the curious..
not sure why my AV tells me this site in insecure. May want to tell them their cert has issues..
Equipment Review: Getting the Most from Your T-5 Lights: A Look at Reflectors and More
It is imperative that you use reflectors with T-5 bulbs, and individual reflectors do a better job of sending light into a tank than a single reflector. Bulb temperature and even an aquarium's background has a measurable effect on lighting performance.www.advancedaquarist.com
2 pm, light is at maximum intensity using the vendor's preprogrammed settings. PPFD = 303; watts - 160. I'll have 24-hour intensities tomorrow and will calculate total light dosage.Thanks. I can test this in another tank. In the meantime, PPFD at 1 pm is 272. Maximum intensity, per this program, is at 2 pm.
Contacted Randy, who will contact Josh.for the curious..
not sure why my AV tells me this site in insecure. May want to tell them their cert has issues..
Equipment Review: Getting the Most from Your T-5 Lights: A Look at Reflectors and More
It is imperative that you use reflectors with T-5 bulbs, and individual reflectors do a better job of sending light into a tank than a single reflector. Bulb temperature and even an aquarium's background has a measurable effect on lighting performance.www.advancedaquarist.com
Contacted Randy, who will contact Josh.
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Thx again for this.Photosynthetically Usable Radiation (PUR), as determined by the Seneye device, is 79-84% about 6 inches below the sensor (in air) indicating blending of differently colored light from the LEDs is pretty good. I'll look at PUR in water once the PPFD datalogging is over.
A little too early to say for sure, but one of these every 4 feet might be enough. Will know much more tomorrow.Thx agai
Thx again for this.
It looks like this thing is a powerful light.
Is it?I went and looked at them too... I mean that's a hefty price tag!!!
You used the term 'caustics.' Big thumbs up!This is how the Photography Industry is using LEDs to provide a diffused light source.
With more LEDs spread out, AND densely packed. The less shadowing, self shadowing, and TV static effect. While retaining shimmer and caustics.
A diffuser panel over the LEDs is an obvious workaround, say with the XR15s, but you lose PAR and shimmer, and distance from the water surface.
The guy’s website appears to be down. I haven’t checked LEDs, specs, or anything else.
We may someday get to the holy grail of LEDs that act just like MH and T5s. They are going to be large panels, with hundreds of individual diodes, mounted close together.
Caustic network is the scientifically-approved term for shimmer, etc.You used the term 'caustics.' Big thumbs up!