Here's a good link:
http://www.ledgroupbuy.com/pages/Cho...ght-optic.html
But it also depends on how deep your tank is. The higher you go, the wider the spread, but the less penetration you'll get at the bottom of your tank.
But with a wider optic like 70*, you can afford to go lower, as the spread is already wider. Just think of a flashlight. Take one and hold it vertically, pointing down, and see how the spread is.
Realistically, I would hang the fixture as low as possible, while still giving you enough clearance to reach your arm into the tank to do daily maintenance.
Quote:
Originally Posted by oupulino
It is interesting read .What is best height to hang if you using 70 deg optic for DIY fixture
|