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If plants can't tell what moonlight is, then how is it that vanilla pollination must be done so precisely

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Question Bank of Biology Questions and Answers - 3

For this reason it is noteworthy that while any light within the PAR range can be used, providing light energy outside certain proven/evolved aspects of PAS can result in poor growth or allowing of less desirable algae to out compete plants or coral we are attempting to cultivate. This why it is a FACT that while certain lights may keep photosynthetic life, less than optimum spectrums found in many of the inferior lights will either produce lessor results and/or require more input light energy for the same results as say a high PAS & PUR light such as the AAP AquaRay.

plants may do a tiny bit of photosynthesis at night from star and moonlight.

PUR cannot be dismissed as some lighting experts have attempted to do based on their short time in the professional aquarium keeping industry, as we have already clearly established (as per the Overview section) that we found that once more precisely tuned spectrum fluorescent lights became available, we could grow aquarium plants more efficiently and with some advancements, this made the difference of not keeping photosynthetic marine organisms at all!! I should note that some of these advancements were comparing apples to apples; T12 to T12 such as a warm white to a Trichromatic or an actinic (which rules out lumens per watt and other measurements and leaves the FACT of PUR).

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We all know that plants can perform the process of photosynthesis in the presence of sunlight

Here is a summary of lighting requirements for different aquarium types. I recommend timers for any aquarium to provide good daylight/night cycles, however this is even more important with Planted Freshwater and Saltwater Reef or Nano Reef tanks. Turn the actinic lights on about one to 1/2 hour ahead of the daylight bulbs and one to 1/2 hour later in the evening.
I generally have the brightest lights on for about 12 hours per day, with 1 or maybe 2 hours of less bright or "ramping" up or down of LEDs if used. Sometimes with MH I will have them in a third cycle that is on for only abut 10 hours or less.

Despite commentary in some aquarium keeping forums, there is NO evidence that ramping up and down much longer than 1 hour where strong lighting is used provides ANY benefit to plant growth, fish, or reef environments (this is not applicable where one low to moderate lighting is used and one on/off cycle is all that is needed).
I have personally kept many aquariums (100s) going back to where only timers were all we had and used single time one for strong lighting, partial tank on with full lighting an hour later, and multiple timers. While have partial lights on for an hour did produce results over a strong on/off, multiple cycles made NO difference!
Think of it this way; in tropical regions, there is little difference in bending of light rays from the sun much past an hour after sunrise or an hour before sunset, so thinking a ramp up/down cycle much more than this time will make a difference has no practical or scientific evidence to back this up.

For LED moonlight settings, generally just a 1-5% of your full lighting power setting is sufficient between main lighting cycles.
If you have separate moonlights, I would run these 8-16 hours (I have yet to find in benefit from this that can be scientifically proven other than aesthetics).

ANY fluorescent light used for aquarium applications such as planted aquariums or reef, slowly burns up phosphors and other rare earth elements that produce the light energy necessary for PUR.
As with a UVC bulb/lamp used for a UV Sterilizer, these lights go through a "half life", meaning that a light that is run 12 hours per day that may last 2 years (as per rated life) should be actually replaced every year otherwise these lamps are running at 50% and less of initial light energy production and then often producing much more yellow light and even an imbalance of red that is inducing to more algae and cyanobacteria growth in particular.

The picture to above/left clearly demonstrates the difference we can see with just our human eye between new 6400K Daylight SHO and one nearly two years old.
The color temperature of the old lamp/light.

From what I personally have observed combined with the opinions of other aquarium professionals is the use of gray nylon filter placed over standard daylights (T2, T5, T8 CFL, etc.) can work as a moonlight; even low level "white" lights such as nightlight bulbs, or even the Rio Mini Sun LED lights can work just fine for this since this has shown to be a more of a low level light issue and timing issue.

Best LED Lighting for Planted and Reef ..

Message: No, moonlight is not strong enough for net photosynthesis in bean plants

Most photosynthetic marine invertebrates should be kept with lamps of a daylight Kelvin temperature from 6400-14,000 K (higher Kelvin with deeper specimen placement, not necessarily tank depth). 20,000K daylight lamps can also be used for deeper tanks (over 22 inches) and/or supplementation with more blue lights (400nm- 490nm).

*Chlorophyll synthesis; occurring in chloroplasts, this is the chemical reactions and pathways by the plant hormone cytokinin soon after exposure to the correct Nanometers wave length , that traps the energy of sunlight for photosynthesis and exists in several forms, the most abundant being Chlorophyll A.
This results in continued growth of a plant, algae, zooxanthellae and the ability to "feed" & propagate. Without this aspect of PAR, zooxanthellae & plants cannot properly "feed" propagate resulting is stunted freshwater plant growth, and eventually poor coral health in reef tanks.
This is also known as the Photosynthetic Action Spectrum (PAS).

Above plants can uptake CO{-2} during the night as well because of their ability to perform a type of photosynthesis called Crassulacean Acid Metabolism (CAM)
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While PUR also encompasses this too it also can simply refer to all light spectrums within PAR with emphasis on the more efficient spectrums rather than the less efficient spectrums such as yellow & green. Or stated another way, the portion of PAR, which is more efficiently absorbed by plants & zooxanthellae photopigments thereby stimulating photosynthesis. We can state PUR one more way, where as PAR is the most important quantity of light, "PUR is the quality of light as per application".

XIX International Botanical Congress

The picture to the left demonstrates this with two 15 Watt CFL (30 watts total) vs one 3rd generation 12 Watt Marine White LED (daylight 14,000K).

This picture is taken with a camera that filters out certain wave lengths allowing for a better viewing of the difference, which is otherwise not easy to discern. However, the picture shows how the LED on the left has less of the less efficient yellow & green than the CFL lights on the right.

Otherwise the light output appears the same, although this is still important when you consider, this is achieved with only 12 watts of LED vs 30 watts of Compact Fluorescent lights.
The picture below shows a spectrograph of two 6500K aquarium lights. One is an AAP AquaRay GroBeam and the other is a 6500 Aquarium CFL. The LED is rated at 12 watts while the CFL is 13 watts.While similar, it is clear to see the LED has more blue and a lower blue NM (fuller blue spectrum) amount as well as more red, less green, and the same yellow.The point this makes/demonstrates is that while both lights are rated as 6500K, they are still not the same in their light energy output. Even among LED lights we can have differences of spectrographs depending upon emitters used.
Think about how mixing all paint colors will produce black, while the mixing of all light energy produces white. We as humans may notice this to some degree, however we do not have the ability to pick out particular colors such as a honey bee can. As well, photosynthetic aquatic life also has differing abilities to pick out the needed light energy for life processes and even though the PAR readings may be equal, the light energy that provides this overall PAR or kelvin "color" is NOT.A Couple more points to better explain the concepts of PUR, "Useful Light Energy", or "Quality of light per application".

For further reading about PUR:*Below is a picture of a Reef Aquarium (88x32x24”) that includes Acropora corals lighted with ONLY VERY high PUR but lower wattage AAP AquaRay NP 1500 & 2000 LED lights (this tank has been running with these lights for 6 months at the time of the picture).

Aquarium Lighting Information Guide | Reef Planted | …

It seems your major concern here is that the plant be able to "sleep" per se; but since most plants produce their own energy "sleep" isn't really necessary. As others have mentioned, respiration (the process of breaking down glucose into energy for the plant, which requires oxygen and of which carbon dioxide is the by product) occurs 24/7. The plant would die without it. Photosynthesis only occurs with light, and only if certain spectrums are present. For examples, plants may do a tiny bit of photosynthesis at night from star and moonlight. But mostly they are completing respiration, which occurs at a constant rate and doesn't change based on whether there is light or not. The plants should be fine with a tiny bit of light, but if you notice the leaves bleaching maybe mention something to your mom. Kinda sounds like she is experienced though.

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