Beamswork 6500k LED for a 75 gallon - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 04-20-2019, 07:27 AM Thread Starter
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Beamswork 6500k LED for a 75 gallon

Hi there, just wondering if one of the 48Ē beamswork 6500k would suffice for a 75 gallon/moderately planted tank?
5200 lumens. If Iím forced to get 2, I wonder if thereís a better ď1 unitĒ solution?

Thx.
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post #2 of 10 (permalink) Old 04-20-2019, 10:02 AM
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Welcome to TPT.

I'm afraid it will take ar least 2 strip-type led fixtures for low to medium light. A cheaper alternative are t5s,.
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post #3 of 10 (permalink) Old 04-23-2019, 02:27 AM Thread Starter
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Thx for the input. How many bulbs/watts of the t5's would I need?
I found a reasonably priced fixture, but I'm not able to hang anything... the fixture must sit on the tank.

https://www.amazon.ca/4ft-Lamps-T5-G...8-1-spons&th=1
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post #4 of 10 (permalink) Old 04-23-2019, 02:53 AM
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post #5 of 10 (permalink) Old 04-23-2019, 02:53 AM
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Not cheap but maybe you could get away with a single twinstar 1200sp or chihiros wrgb 120?
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post #6 of 10 (permalink) Old 04-23-2019, 04:19 AM
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4 bulbs is plenty, 6 with 2 switches / power cable would give more flexibility for high light.

You can hang these fixtures off 2 L pipes attached to the stand, there are some kits or you could make it yourself.
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post #7 of 10 (permalink) Old 04-25-2019, 10:31 PM Thread Starter
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Originally Posted by jeffkrol View Post
That one is definitely tempting! Thank you for using the canadian site :-)

I understand that some lights Must be hung because the aquarium might not have a lid, or it's like an LED Cob type thing.

But is there a method of determining the "proper height" of a large fixture light for a particular aquarium? i.e.) how do you determine if a fixture should sit directly on the glass top or if it should be suspended at a particular height?

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Originally Posted by Wobblebonk View Post
Not cheap but maybe you could get away with a single twinstar 1200sp or chihiros wrgb 120?
Yeah, good luck explaining those prices to my Principal!! Gorgeous lights but no.

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4 bulbs is plenty, 6 with 2 switches / power cable would give more flexibility for high light.

You can hang these fixtures off 2 L pipes attached to the stand, there are some kits or you could make it yourself.
Funny enough, my class made a PVC pipe light stand last year. We use it to grow veggies in our class. But I trust my kids and am always around. Unfortunately, this aquarium will be in a public space so I will not be permitted to "suspend" any lights.

Last edited by Fishbulb80; 04-25-2019 at 10:47 PM. Reason: Adding quotes
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post #8 of 10 (permalink) Old 04-25-2019, 10:44 PM
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Originally Posted by Fishbulb80 View Post
That one is definitely tempting! Thank you for using the canadian site :-)



But is there a method of determining the "proper height" of a large fixture light for a particular aquarium? i.e.) how do you determine if a fixture should sit directly on the glass top or if it should be suspended at a particular height?

simple trigonometry and knowing the diode beam angle/spread..


another light...90 degree emitters

https://www.amazon.com/dp/B07KLJLWZP..._uboVCb61K8RMS

"A man with a watch knows what time it is. A man with two watches is never sure."
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post #9 of 10 (permalink) Old 04-25-2019, 10:53 PM Thread Starter
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simple trigonometry
Pretty sure that's an oxymoron for most of us :-)
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post #10 of 10 (permalink) Old 04-25-2019, 11:59 PM
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Originally Posted by Fishbulb80 View Post
Pretty sure that's an oxymoron for most of us :-)

https://store.marinebeam.com/beam-angle-calculator-1/

Just consider the outer rows...
Most small diodes (w/ the exception I listed above ) are lensed at about 120 degrees
So each diode will produce a cone of light covering x area based on height

Say you have a panel that's covered in 120 degree diodes in an area of about

3 x 12 inches..(diode area not "panel" area)

At 4" above the water surface each diode produces a 14" spot size..
Now since only the outer diodes "count" for this and 1/2 of the spot is "inside" the footprint only the outside 1/2 "counts"..so back to 3x 12


7+3+7 = 17"
7+12+7 =26"
Your major light will fall in a 17" x 26" area on the water surface @ 4" height..

After hitting the water the light gets partially trained by refraction and reflections so in a sense or unless one wants more light at the bottom.. this is the sweet spot height w/ less "spill" outside the tank..




Not using math just raise the light on a white sheet/paper and trace around the brightest rectangle.

"A man with a watch knows what time it is. A man with two watches is never sure."

Last edited by jeffkrol; 04-26-2019 at 01:44 AM. Reason: edit
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