Hi
I am trying to buy some really bright leds for a project I’m working on. I have been to various sites that sell leds. Digi-key was the first place I checked. They have these leds that have a high mcd rating. For example this white led was rated at 11000mcd(441-1009-ND). I bought some of these leds and when I powered them up they weren't bright at all. I have some white 2300mcd leds that seem a lot brighter. Digi-key sells other colours of leds produced by the same manufacture with extremely high mcd ratings as well. I also got some of these leds and they didn't seem that bright despite the high mcd ratings.
So my question is how is the brightness of leds measured and how does the View Angle of the led affect the brightness? I have seen a 11,600mcd green led with a view angle of 15 and a 7200mcd green led with a view angle of 30. Which one would look brighter?
I am trying to buy some really bright leds for a project I’m working on. I have been to various sites that sell leds. Digi-key was the first place I checked. They have these leds that have a high mcd rating. For example this white led was rated at 11000mcd(441-1009-ND). I bought some of these leds and when I powered them up they weren't bright at all. I have some white 2300mcd leds that seem a lot brighter. Digi-key sells other colours of leds produced by the same manufacture with extremely high mcd ratings as well. I also got some of these leds and they didn't seem that bright despite the high mcd ratings.
So my question is how is the brightness of leds measured and how does the View Angle of the led affect the brightness? I have seen a 11,600mcd green led with a view angle of 15 and a 7200mcd green led with a view angle of 30. Which one would look brighter?