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At night or in indoor locations not facing
daylight sun, most LED's will give nearly 120° viewing. In addition,
during daytime under direct sunlight, basic Ultra bright LED's (e.g. our
model no. UB415) will give 60º viewing. More advanced wider angle ultra bright LED's will achieve
70° under sunshine.
Viewing Distance
The chart below gives the height of character
required for a particular viewing distance. This is approximate as you
should also take into account ambient light levels (e.g. bright day or
night) and the brightness of the LED used in the sign.
|
Character
Height (cm) |
Character
Height
(inch) |
Reading
Distance (m) |
Reading
Distance (m) |
| 3 |
1.18 |
18 |
59 |
| 5 |
1.97 |
30 |
98 |
| 10 |
3.94 |
60 |
197 |
| 18 |
7.09 |
108 |
354 |
| 22 |
8.66 |
132 |
433 |
| 44 |
17.32 |
264 |
866 |
| 66 |
25.98 |
396 |
1299 |
| 100 |
39.37 |
600 |
1969 |
| 200 |
78.74 |
1200 |
3937 |
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Millicandela
(mcd)
This is a unit of measurement of brightness for a single LED.
Anything less then 300mcd is not adequate for use under sunlight.
| Standard red |
(e.g.
model no. 215 R) |
20-50 mcd |
| Multi-color |
(e.g.
model no. Big
Dot) |
200-250 mcd |
| Ultra-bright |
(e.g.
model no. MegaStar) |
1000
mcd |
NIT
This is a unit of measurement normally used to describe
the brightness on bigger signs. It is defined as candela per square meter.
It is calculated as (candela per pixel) x (no. of pixels
per square meter).
For example, MegaStar 200/4 using 1000 mcd mono-color LED's It's
brightness is:
(1.0 x 64 x 32) / 0.5 m2 = 4096 NIT.
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