<a href=showthread.php?s=&postid=13502465#post13502465 target=_blank>Originally posted</a> by hahnmeister
As for the 'ring' to direct the light... you might want to consider that the light coming down the shaft in these things is alot different than a bulb in a relative shallow reflector...
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The light isnt from a point source, but enters at all angles (a). As the light comes in at a more and more of an angle... it will bounce off the sides of the 'tube' more and more... every time it does it will lose some of its intensity... say... with some miro that is 95% reflective... after hitting the sides of the tube a dozen or so times... you can lose a good percentage of the light coming in (an argument that the further north you are, the more you might consider having your sola tubes come down at an angle... perhaps the average angle of the sun at noon as it varies throughout the year... so you have more direct light).
If you decide on adding a 'ring' of reflective material to help guide the light downwards, also consider that since this isnt a point source light, like from a bulb, having a curved reflector is rather pointless. If you have a 'spherical' shape (b), you arent helping the light that hits the ring towards the bottom since its almost parallel with the sola-tube.... so what's the point? With a 'parabolic' (c), you have much the same, but at the top of the reflector... light that hits it at a sharp angle will still exit at a sharp angle. So the best 'average' is actually just a flat sided funnel (d)... which is nice because its the easiest to make. It will bend the most light downwards, and by making it 'flat sided', you can even have the angle be adjustable (so you can vary the funnel walls from say.... 45 degrees to 30 degrees) by having the bottom edge overlap and be adjustable with clamps (top edge stays the diameter of the sola tube, bottom diameter can change in diameter... like an aperture on a camera).
<a href=showthread.php?s=&postid=15184002#post15184002 target=_blank>Originally posted</a> by Western_reefer
VERY nice reef Jim!!
<a href=showthread.php?s=&postid=15238169#post15238169 target=_blank>Originally posted</a> by shikhyung
Hello, Im thrill to this. I have few questions.
1-Is there any different with the solar tube that we find in local hardware like lowe or HD?
2-How to determine the distance of the tubes to the surface of the water?
3-Is there any diffuser at all, if no, how to keep moisture out of the tube?
4-with the tank 50" length, how many tubes requires?
Thanks,
<a href=showthread.php?s=&postid=12984396#post12984396 target=_blank>Originally posted</a> by Reefski's
it does really work. now if i can just get rid of the algae...
Carl