Trigonometry Genius Needed

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?
 
Radius of base = Height X Tan 30 (30 degrees being half the included angle)

R = 8 X Tan 30
Dia. = 2 ( 8 X Tan 30)
Dia = 2(8 X 0.577)
Dia = 9.232

QED

Cheers !!!
 
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! ;)
 
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!
 
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?
 
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.
 
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.
 
Back
Top