drummereef
Team RC
Can someone who remembers trigonometry calculate something for me? :facepalm:
What is the base diameter of an 8 inch tall, 60 degree cone?
What is the base diameter of an 8 inch tall, 60 degree cone?
Trigonometry Genius Needed
- Thread starter drummereef
- Start date
Skinnysloth
New member
http://www.csgnetwork.com/righttricalc.html
9.24"
edit: Heliman's explanation was more elegant and correct.
9.24"
edit: Heliman's explanation was more elegant and correct.
Last edited:
woodnaquanut
Active member
Dusting off very unused brain cells, I come up with 9.23 in.
Tan(30) * 8 = 4.6188 <radius
4.6188 * 2 = 9.2376
I'm willing to except corrections to this. It's been a LONG time since High School math!
Tan(30) * 8 = 4.6188 <radius
4.6188 * 2 = 9.2376
I'm willing to except corrections to this. It's been a LONG time since High School math!
woodnaquanut
Active member
Good job Heliman and Skinnysloth! Accurate (well at least you agreed with my answer 
) and fast. Extra props to Heliman working so early in the AM!
) and fast. Extra props to Heliman working so early in the AM!
drummereef
Team RC
Thanks guys. I'm trying to see what the general light spread of a single 60 degree optic hung 8" over the water surface would be. I'm assuming it would be a 60 degree cone shape of light coming off the optic correct?
I'm trying to see what the general light spread of a single 60 degree optic hung 8" over the water surface would be. I'm assuming it would be a 60 degree cone shape of light coming off the optic correct?BeanAnimal
Premium Member
Multichip "lens"... then yeah
Single emitter "optic"... then no
The single emitter optics are not tightly focused. The angle rating relates to the percentage of light that falls within that general cone, but the actual light spread is much wider. You will have to look at the optic datasheets to find out what that the actual definition is, though I am sure there are folks here who know.
For actual LENS type optics being sold for the multichip emitter panels, they are more or less a true focused lens that creates a cone of light close to the rated angle.
Single emitter "optic"... then no
The single emitter optics are not tightly focused. The angle rating relates to the percentage of light that falls within that general cone, but the actual light spread is much wider. You will have to look at the optic datasheets to find out what that the actual definition is, though I am sure there are folks here who know.
For actual LENS type optics being sold for the multichip emitter panels, they are more or less a true focused lens that creates a cone of light close to the rated angle.
drummereef
Team RC
Multichip "lens"... then yeah
Single emitter "optic"... then no
The single emitter optics are not tightly focused. The angle rating relates to the percentage of light that falls within that general cone, but the actual light spread is much wider. You will have to look at the optic datasheets to find out what that the actual definition is, though I am sure there are folks here who know.
For actual LENS type optics being sold for the multichip emitter panels, they are more or less a true focused lens that creates a cone of light close to the rated angle.
Makes sense, and might prove to be better for my application. I'm making a couple single string Cree XT-E Royal Blue accent strips for my tank. I'm using the Carclo Ripple Wide optics, hung ~8" over the water surface. Trying to see how far apart I can space the LEDs (single string) and still get a decent amount of overlap so there's minimal dead space in the tank.
