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What is PAR?

PAR means Photosynthetic active radiation is a measurement of light power between 400nm and 700nm. It is used to give an indication of the power of light present that is used by organisms which have photosynthetic cells such as plants and corals.


Marine Coral Reef PAR Levels

The list below shows the light ranges needed for coral growth in saltwater.

The minimum figures are used as a guide line where growth will be minimal and the health of the coral may come into question.
At the maximum level no more growth will occur for an increase in light.

Remember PAR is a better measurement of quantity of light than quality.
A Seneye reef device will help you do more analysis than just PAR.


Kelvin Lux PAR (µE m2 sec)
Organism Genus Species Lighting Req Min Max Min Ideal Max Min Ideal Max
Coral Acropora cervicornis Medium 281 306 331
Coral Acropora digitifera High 82 327 600
Coral Acropora divaricata Very Low 10 77 200
Coral Acropora formosa High 170 340 600
Coral Acropora gemmifera High 170 340 600
Coral Acropora granulosa Low 53 107 450
Coral Acropora microphthalma High 170 300 600
Coral Acropora millepora (coenosarc) Medium 100 190 500
Coral Acropora millepora (polyp) Medium 140 230 550
Coral Acropora nobilis (coenosarc) 170 310 600
Coral Acropora nobilis (polyp) 100 180 500
Coral Acropora Species Medium 131 246 503
Coral Cyphastrea serailia 100 150 200
Coral Cyphastrea Species 100 150 200
Coral Montipora capitata 6750 12500 135 193 250
Coral Montipora tuberculosa (coenosarc) Low 130 180 250
Coral Montipora tuberculosa (polyp) 100 300 400
Coral Montipora Species 6750 12500 122 224 300
Coral Pocillopora damicornis Medium 100 300 400
Coral Pocillopora eydouxi High 250 323 425
Coral Pocillopora meandrina 13750 21250 275 350 425
Coral Pocillopora Species 13750 21250 225 299 417
Coral Pavona varians Low 5500 17500 110 230 350
Coral Pavona Species 110 230 350
Coral Porites cylindrica 150 200 250
Coral Porites lobata Medium 12500 17500 250 300 350
Coral Porites lutea High 20000 37500 400 575 750
Coral Porites Species 16250 27500 267 358 450
Coral Sinularia densa High 10350 20000 207 304 400
Coral Sinularia Species 10350 20000 200 300 400
Coral Stylophora pistillata (Shade) Diverse 40 200 600
Coral Stylophora pistillata (Light) Diverse 40 300 600
Coral Stylophora Species 40 250 600
Kelvin Lux PAR (µE m2 sec)
Organism Genus Species Lighting Req Min Max Min Ideal Max Min Ideal Max
Coral Acropora Species 70 600
Coral Alcyonium Species 200 800
Coral Blastomussa Species 200 600
Coral Briareun Species 200 700
Coral Fungia Species 600 900
Coral Montipora Species 135 500
Coral Nephthea Species 200 900
Coral Pachyclavularia Species 200 700
Coral Pocillopora Species 200 600
Coral Sarcophyton Species 200 800
Coral Stylophora Species 40 600
Coral Dendronephthya Species N/A N/A
Coral Tubastrea Species N/A N/A


Important – please read carefully

Before changing your lighting product to a new lighting product, always ensure that you plan plenty of time to acclimatise your corals to the new lighting source that you are changing to. This can be done by running the old lighting unit alongside the new lighting unit or by raising the new lighting unit higher than the old lighting unit position. This is to reduce the lighting stress that can be created to the corals of a much more powerful lighting source than the one they have become accustomed to. This could lead to the changing of their symbiotic Algae and Bacteria types and numbers present and if done too quickly may end up killing them off and bleaching the corals.

This needs to be taken into consideration for all technologies of lighting whether it be fluorescent, LED or metal halide lighting forms. Arcadia cannot be held responsible for any issues with corals or any other inhabitants due to improper acclimatisation of your corals /inhabitants to the new source of lighting you have provided for this purpose.



 

Freshwater Plant PAR Levels

The list below shows the light ranges needed for plant growth in freshwater.

The minimum figures are used as a guide line where growth will be minimal and the health of the plant may come into question.
At the maximum level no more growth will occur for an increase in light.

Remember PAR is a better measurement of quantity of light than quality.
A Seneye reef device will help you do more analysis than just PAR.

 

Kelvin Lux PAR (µE m2 sec)
Organism Genus Species Lighting Req Min Max Min Ideal Max Min Ideal Max
Plant Anubias angustifolia 40 125 200
Plant Anubias barteri 40 75 125
Plant Anubias nana 40 75 125
Plant Anubis Species 40 100 200
Plant Aponogeton Species High 100 150 200
Plant Bacopa Monnieri 100 175 250
Plant Bacopa Species 100 175 250
Plant Cabomba caroliniana Medium 1500 3000 100 150 200
Plant Cabomba Species High 1500 3000 100 150 250
Plant Crinum Species High 100 150 200
Plant Cryptocoryne beckettii 50 125 200
Plant Cryptocoryne wendtii 50 125 200
Plant Cryptocorynes Species Low 40 50 200
Plant Echinodorous barthii High 150 200 250
Plant Echinodorous bleheri Low – Very High 40 175 250
Plant Echinodorous macrophyllus Average to High 50 150 200
Plant Echinodorous osiris Average to High 50 150 200
Plant Echinodorous ozelot 50 150 200
Plant Echinodorous palaefolius 100 200 250
Plant Echinodorous quadricostatus 50 150 200
Plant Echinodorous rose 50 100 150
Plant Echinodorous rubin 50 150 200
Plant Echinodorous tenellus 100 150 200
Plant Echinodorous uruguayensis 75 175 250
Plant Echinodorous Species Medium 50 100 150
Plant Hygrophila polysperma 150 200 250
Plant Hygrophila Species 150 200 250
Plant Lilaeopsis Species High 100 150 200
Plant Limnophila Species High 100 150 200
Plant Ludwigia Species High 100 150 200
Plant Microsorum pteropus 40 125 200
Plant Microsorum Species 40 125 200
Plant Myriophyllum Species High 100 150 200
Plant Nesaea Species High 100 150 200
Plant Nymphaea Species High 100 150 200
Plant Pogostemon Species High 100 150 200
Plant Rotala Species High 100 150 200
Plant Sagittaria Species High 100 150 200
Plant Versicularia dubyana 40 125 200
Plant Versicularia Species 40 125 200
Plant Vallisneria americana 50 150 200
Plant Vallisneria spiralis 40 150 200
Plant Vallisneria Species 40 150 200
Plant Egeria densa 100 150 250
Plant Egeria Species 100 150 250