LED strip light

LED STRIP LIGHT

DESIGN
Variables in strip lighting consist of water resistance, colour, adhesives, choice of SMD, driving
voltage, and whether it is constant current or constant voltage layout.
The most common design differences are in how individual LEDs are controlled, specifically
differences in color and whether or not each LED is addressable.
Single Color, non-addressable: Every LED on the strand is a single white colour, typically
ranging from 2700K to 6500K in colour temperature, or any of several monochrome colors
covering the range of the visible spectrum (generally from 400-700 nanometers in wavelength).
Multicolor, non addressable: Each LED is capable of displaying red, green, blue, or all three
(white), driven by three input power rails. All the LEDs display the same colour at any one time,
but the colour can be manipulated by varying the voltage applied to each of the three power
inputs.

R G B , a d d r e s s a b l e : M u l t i p l e c o l o u r s
a n d a d d r e s s e s . E a c h L E D h a s i t s o w n
c h i p m e a n i n g t h e y c a n b e i n d i v i d u a l l y
t r i g g e r e d f o r c h a s i n g , s t r o b i n g , a n d
c o l o u r c h a n g i n g .
L E D s t r i p d e s i g n s a r e a v a i l a b l e
p o p u l a t e d w i t h m a n y d i f f e r e n t t y p e s
o f S M D , n o t o n l y i n d i f f e r e n t c o l o u r s
a n d a d d r e s s a b l e o r n o n - a d d r e s s a b l e ,
b y d i f f e r e n t s h a p e s , s i z e s , a n d p o w e r
l e v e l s .
L E D s t r i p l i g h t s m o s t c o m m o n l y
o p e r a t e o n 1 2 o r 2 4 v o l t s o f d i r e c t
c u r r e n t f r o m a p o w e r s u p p l y ,
s o m e t i m e s r e f e r r e d t o a s a d r i v e r .
U S B s t r i p l i g h t s o p e r a t e o n t h e
s t a n d a r d 5 - v o l t d i r e c t c u r r e n t u s e d
b y U S B d e v i c e s .
A n y c u s t o m i z a t i o n s r e q u i r e a n L E D
c o n t r o l l e r t o a d j u s t b r i g h t n e s s ,
c o l o u r , o r i n d i v i d u a l L E D a c t i v i t y .
T h i s c a n b e d o n e w i t h a n i n c l u d e d
c o n t r o l l e r o r c u s t o m i z e d w i t h a
m i c r o c o n t r o l l e r .
Beam Angle
Typical SMD LEDs are rated as having a 120° beam angle, directed "up", ie.
perpendicular to the mounting surface. 'Side View' or 'Edge Emitter' SMDs
are designed is such that light is emitted parallel to the adhering surface (ie,
90 deg difference to typical tape design). These allow the construction of
LED strips which wash surfaces within less space or accent edge profiles
such as signage.

D i m m i n g
L E D s t r i p s a r e n o t d i m m a b l e i n t h e c o n v e n t i o n a l
s e n s e . A t t e m p t i n g t o v a r y t h e b r i g h t n e s s o f t h e
L E D s b y c h a n g i n g t h e e x t e r n a l v o l t a g e i s
i m p r a c t i c a l . H o w e v e r , t h e y c a n b e d i m m e d u s i n g
p u l s e - w i d t h m o d u l a t i o n ( P W M ) d i m m e r s . T h e s e
r a p i d l y s w i t c h t h e L E D s o n a n d o f f , t y p i c a l l y 2 0
t i m e s p e r s e c o n d , b y c h a n g i n g t h e v o l t a g e f r o m
z e r o t o t h e e x p e c t e d v a l u e a s a s q u a r e w a v e .
A p p l i c a t i o n s
S t r i p l i g h t s a r e d e s i g n e d f o r b o t h i n d o o r a n d
o u t d o o r u s e d e p e n d i n g o n w h e t h e r t h e y ’ r e w a t e r
r e s i s t a n t . S i n c e t h e s t r i p i s f l e x i b l e a n d c a n b e
d i v i d e d a t a n y p o i n t b e t w e e n L E D s , i t i s e x t r e m e l y
v e r s a t i l e a n d c a n b e u s e d i n a n u m b e r o f
i n s t a l l a t i o n s . O u t s i d e o f t r a d i t i o n a l l i g h t i n g , s t r i p
l i g h t i n g i s e x t e n s i v e l y u s e d i n D I Y p r o j e c t s o r
l i g h t e d c l o t h i n g .
Article Source
https://en.wikipedia.org/wiki/LED_strip_light
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