Actinic Fluorescent Bulb

Written by admin on July 23, 2010 - 0 Comments
Categories: Products

Actinic Fluorescent Bulb

FINNEX 48'' Aquarium Light T5 4x54 Watt Daylight & Blue Moonlight LED

FINNEX 48” Aquarium Light T5 4×54 Watt Daylight & Blue Moonlight LED

$186.99

NEW Finnex High Output T5 4×54 Watt (bulbs included: 2×10,000k Daylight & 2xActinic Blue) w/ LED Blue Moonlight Shimmering Effect. Finnex light fixtures are a top choice to keep your sea creatures in the most optimal lit environment. This masterful aquarium light will keep your corals thriving. This particular Finnex fixture offers a spectacular blue LED moonlight shimmering effect for both owners…

Coralife Actinic T5 Fluorescent Light Bulb (24 Inch, 14 Watt Lamp)

$10.99

The Coralife Actinic 03 Blue lamp is a 100% blue actinic 03 phosphor that peaks at 420 nanometers. Lighting with a higher blue component better simulates the softer shades of dusk, dawn and the blue hue of deeper water. Additionally, many marine invertebr…

Coralife 7100K Actinic Blue Fluorescent Light Bulb (48 Inch, 40 Watt Lamp)

$19.99

Coralife 48 inch Actinic Blue Lamp 7100K The Coralife Actinic 03 Blue lamp is a 100% blue actinic 03 phosphor that peaks at 420 nanometers. Lighting with a higher blue component better simulates the softer shades of dusk, dawn and the blue hue of deeper water. Additionally, many marine invertebrates depend on blue light, the wavelength that most deeply penetrates water….

What is actinic lighting?

A couple days ago, I recently bought this for my freshwater planted community tank: http://www.petco.com/product/11440/Coralife-Mini-Compact-Fluorescent-50-or-50-Bulb.aspx
And I wondered what actinic lighting is. Also, would it benefit freshwater plant growth?

In order to begin to understand the available spectrums of bulbs, we must first analyze how light naturally penetrates water. Red light is the first to be filtered out and can only penetrate a short distance. As light waves penetrate deeper into the water, orange and yellow are lost next. Of all the colors of the spectrum blue light penetrates the deepest.

Light spectrum is measured by the Kelvin scale. Natural sunlight on a clear day registers at 5500 Kelvin degrees. Kelvin temperatures less than 5500 become more red and yellow and the higher the Kelvin temperature the more blue the light is. Photosynthetic invertebrates should be kept under lamps rated at or near the Kelvin temperature where the invertebrate was collected. Shallow water species should be kept under 10000K lamps while deep water species would prefer 20000K lighting. Longer photoperiods can not compensate for incorrect light spectrum or intensity.

Actinic lighting peaks in the 420 nanometer range and emits a fluorescent blue light and is usually used as supplemental lighting. Not only is actinic lighting beneficial to photosynthetic invertebrates, it is also aesthetically pleasing to the eye when used to supplement “daylight” lighting.

Freshwater aquarium plants benefit from lighting with a Kelvin temperature in the range of 5500 – 6500 degrees. Freshwater plants prefer light with more red and yellow in the spectrum.

The context with which I believe the statement that actinics are for nothing more than aesthetics is that it isn’t that important what the composition of the spectrum of the bulb is, as long as there is enough light of the appropriate wavelengths for photosynthesis to occur. So as long as you satisfy the needs of photosynthesis, beyond that it doesn’t matter what bulbs you use, actinic, day light etc.

The spectrum from actinic lights are important, because of the fact it is important for photosynthesis. So on this basis saying actinic lights is for aesthetics is incorrect, it can be very important if it is the important/dominant source of light of the right spectrum for photosynthesis to occur.

Whether actinics is important depends on how the tank is set up and the amount of light that the actinics contribute to the total photosynthetic available radiation. For example if you are running a 250W 6,000K MH with 40W of NO, then the NO contribution to the PAR is pretty insignificant and whether you use actinic or daylight is of no real consequence to the photosynthetic organisms in the tank. But your choice of NO will make a difference in how the tank appears to the human eye. Now what happens when you turn around and are just running NO or VHO over a tank? Half daylight and half actinic, are the actinics now there just for the look of the tank? Of course not, now it is making up a significant amount of the PAR.

http://www.aquarium-lighting-guide.com/aquarium_lighting_guide

So to answer your question a bit more directly, Yes actinic may aid photosynthisis in yout freshwater tank. However, it depends on what other light sources you have available and what their spectrium range is. It also depends on what type of plants you are trying to grow. If the plants are not normaly deep water plants and you have other full spectrum bulbs, or grow bulbs, on your tank it is unlikely that actinic lighting would have much affect on your tanks photosynthitic potential. If you are growing algae the actinics could be more important. Genneraly I associate
actinics with salt water tanks and corals. The blue color could be very pleasing in a fresh water tank though.

Hope that this helps. Good Luck !