Hi guys, ive built a big SSD using 360 x 5mm LED’s. It has 4 digits including decimal points for each. i tested it out today and it was a total fail. The LED’s are so dim i cannot see them glow in the sunlight. i am powering them with 12v. each segment of the seven segment display contains 12 LED’s of which there are 3 parallel lines each containing 4 LED’s in series. each parallel line has a 100 ohm resister to limit current to approximately 20ma. i have included the spec sheet information in the picture attached.
My problem is that i do not understand how to select an LED according to how i want it to perform in my mind. The reason why i bought these were they had an mcd of 45 as shown in this link http://za.rs-online.com/web/p/visible-leds/6466642/
Now i had LED’s that had an mcd of 20 and they were bright so i thought an mcd of 45 would be brighter but they dimmer? so am i missing something?
can you guys also give me advice on what color and viewing angle would be best for daylight viewing? this is used for a motocross track timer and must be able to be viewed by riders in sunlight while riding. thanx for any help