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These will come with 80 degree optics for spread of light. The Diameter of the physical heat sink will be 5".
If you have a nano or pico tank with a fairly small footprint the RapidLED PAR38 lights are perfect for your tank. PAR38 lamps can either be the main light source or be an accent to a larger light.
Actinic PAR38 - Great for adding that extra pop to your corals you will not normally see during daylight hours. Spectrum range from 420nm to 480nm
Daylight Reef PAR38 - Awesome daylight LED light for pico reef tanks. Emits a 17,000 K - 20,000 K spectrum which will allow your corals to grow fast and healthy with great coloration.
Refugium PAR38 - Producing roughly 10,000 K spectrum that will efficiently grow macroalgae and other types of plants. This light can also be used on freshwater tanks.
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great light By lee on 7/4/2016lee would recommend this product to a friendI have it over a 29gal (30lx13wx19h) reef setup 7in. above the tank. placed over the middle of tank the spread is a good 24in. Just enough for moon lighting and sunrise, but 2 would be better for end to end coverage. It reaches bottom of the tank and some corals really pop under the actinics. Definitely will buy another one.