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Photosynthetically active radiation (PAR) is defined as electromagnetic radiation over the spectral range of 400 nm to 700 nm that photosynthetic organisms are able to use in the process of photosynthesis to the carbon in CO­2 into carbohydrates. Horticulturalists measure PAR for both plant research and greenhouse lighting design (e.g., Barnes et al. 1993) using specialized photometers (e.g., Biggs et al. 1971).

• Red LED for photosynthesis & improved color rendition

Our Penetrator Grow Lights include 440nm, 470nm, 640nm, 660nm, white and infra-red LED’s.

Appendix A – Photosynthesis and Visible Light

In a separate experiment, we doubled the intensity of the LED lights (about 400 W) over the tomatoes in their vegetative phase. As with the previous experiment, the testing was done in a controlled 4x4 growing area and closely monitored.

Although the experiment is still in progress, at the time of this publication, we noted the growth of the plant. Leaves grew wider with a darker green color, indicating high levels of chlorophyll, even in the lowest tier of the plants. With this added intensity, the tomato plants began to flower in just two weeks. The flowering stage for these tomatoes began early in comparison to the plants in the previous experiment, which began to flower after four weeks. It is clear that these tomato plants benefited from the extra boost of light.

LED Lighting & Photosynthesis Guide | Fluence Bioengineering

The problem is that lighting designers and horticulturalists generally do not speak the same language. Whereas we speak in terms of lumens and illuminance, horticulturalists speak in terms of photosynthetically active radiation (PAR) and photosynthetic photon flux density (PPFD). Ask for an explanation of these terms and you will hear talk of micromoles, and possibly microeinsteins, of photons. Instead of luminous flux, there is quantum flux. It can be very confusing, not to say frustrating.

Without light, there is no photosynthesis and O is consumed and CO2 is released.

Student-Led Photosynthesis Investigation - Share My …

In order for photosynthesis to begin, light and carbon dioxide must be taken in through the leaf's stomata, tiny openings on the surface of the leaf.

LED Lights and Digital Horticulture Solutions | Illumitex

These are on two different channels. Daylight can be controlled separately from the actinics (with the use of a controller).
One channel is all the Fiji Blues and NUV long with one NP Blue. The other channel is the daylight, red and remaining three NP Blue (full spectrum)

Best LED Grow Lights 2017, for Plants, Crops and Cannabis

• 2058 Lumens, PAR 148 uEinsteins/sec/m2 @16 inches at maximum PUR (not CRI & other gimmicks), providing high light tropical sun natural daylight in the natural spikes needed by plants.
There is simply NO better planted aquarium LED for those looking normal natural growth (including the models #400 tile & #600 strip).
With the highest water proof rating and longest warranty and there is still NO BETTER Planted or Fish only freshwater light!!

The range of irradiance values where photosynthesis does not vary with irradiance is called .

Photometry and Photosynthesis | All Things Lighting

PAM Fluorometer: A device capable of monitoring chlorophyll fluorescence, and is capable of calculating the fate of absorbed light energy, either through photosynthesis or two other dissipation pathways (including NPQ: Non-Photochemical Quenching of chlorophyll fluorescence by protective xanthophylls) or NO (dissipation by other pathways, including photoinhibition.) PAM stands for Pulse Amplitude Modulated light intensity. PAR (Photosynthetically Active Radiation): That visible light energy between 400 and 700nm. It is important to note that photosynthesis does not simply stop at wavelengths below 400nm - violet and some ultraviolet wavelengths can promote photosynthesis!

Performance LED Grow Lights - excite International

• Two of these Coral Colour Plus Ultima LEDs can easily light a 48 inch by 18 inch marine aquarium (2) Marine Blue 600s could be added for an advanced reef tank of this size)

Effects of Blue and Red Light on the Rate of Photosynthesis

Photopigments: Organic substances responsible for collecting light energy and hence the promotion of photosynthesis. Common photopigments in zooxanthellae are chlorophyll , chlorophyll peridinin, and -carotene.