<s>
ThinkLight	B-Device
was	O
a	O
keyboard	B-Device
light	O
present	O
on	O
many	O
older	O
ThinkPad	B-Operating_System
families	O
of	O
notebook	B-Device
computers	I-Device
.	O
</s>
<s>
The	O
ThinkLight	B-Device
has	O
been	O
replaced	O
by	O
a	O
backlight	O
keyboard	B-Device
on	O
later	O
generations	O
of	O
ThinkPads	B-Operating_System
,	O
and	O
Lenovo	O
has	O
discontinued	O
the	O
ThinkLight	B-Device
in	O
2013	O
.	O
</s>
<s>
A	O
white	O
or	O
amber	O
LED	O
(	O
depending	O
on	O
model	O
)	O
is	O
located	O
on	O
the	O
top	O
edge	O
of	O
the	O
display	B-Device
,	O
illuminating	O
the	O
keyboard	B-Device
to	O
allow	O
use	O
in	O
low-light	O
conditions	O
.	O
</s>
<s>
It	O
is	O
activated	O
with	O
the	O
key	O
combination	O
Fn-PgUp	O
(	O
the	O
bottom	O
left	O
and	O
top	O
right	O
keys	O
of	O
the	O
keyboard	B-Device
)	O
.	O
</s>
<s>
Later	O
ThinkPads	B-Operating_System
use	O
the	O
combination	O
Fn-Space	O
instead	O
.	O
</s>
<s>
Lenovo	O
later	O
started	O
to	O
include	O
backlit	O
keyboards	B-Device
,	O
and	O
some	O
models	O
included	O
both	O
the	O
ThinkLight	B-Device
and	O
a	O
backlit	O
keyboard	B-Device
.	O
</s>
<s>
For	O
those	O
models	O
,	O
the	O
Fn-Space	O
shortcut	O
is	O
also	O
used	O
in	O
conjunction	O
to	O
control	O
a	O
backlit	O
keyboard	B-Device
(	O
if	O
the	O
laptop	B-Device
has	O
it	O
)	O
.	O
</s>
<s>
The	O
on-screen	O
display	B-Device
of	O
ThinkPad	B-Operating_System
computers	O
will	O
display	B-Device
a	O
light	O
on	O
and	O
a	O
light	O
off	O
indicator	O
.	O
</s>
<s>
The	O
ThinkLight	B-Device
can	O
be	O
activated	O
when	O
the	O
monitor	O
is	O
on	O
or	O
off	O
but	O
not	O
while	O
the	O
computer	O
is	O
off	O
.	O
</s>
<s>
Some	O
ThinkPads	B-Operating_System
,	O
like	O
the	O
Z	O
and	O
R	O
series	O
(	O
though	O
not	O
all	O
-	O
some	O
R61	O
and	O
R32	O
models	O
still	O
have	O
the	O
white	O
light	O
)	O
feature	O
an	O
amber	O
LED	O
due	O
to	O
the	O
lower	O
cost	O
,	O
while	O
other	O
models	O
,	O
like	O
the	O
T	O
series	O
,	O
use	O
a	O
white	O
LED	O
(	O
which	O
is	O
generally	O
preferred	O
)	O
.	O
</s>
<s>
The	O
G	O
series	O
and	O
SL	O
series	O
omit	O
the	O
ThinkLight	B-Device
.	O
</s>
<s>
A	O
few	O
ThinkPads	B-Operating_System
(	O
17	O
"	O
W700	O
and	O
W701	O
)	O
have	O
featured	O
the	O
ThinkLight	B-Device
with	O
dual	O
white	O
LEDs	O
.	O
</s>
<s>
The	O
HP	B-Device
EliteBook	I-Device
series	O
notebooks	B-Device
contain	O
a	O
similar	O
keyboard	B-Device
light	O
called	O
HP	B-Device
Night	I-Device
Light	I-Device
.	O
</s>
<s>
Unlike	O
the	O
ThinkLight	B-Device
,	O
it	O
is	O
activated	O
by	O
a	O
physical	O
button	O
next	O
to	O
the	O
Night	B-Device
Light	I-Device
,	O
rather	O
than	O
a	O
keyboard	B-Device
shortcut	O
.	O
</s>
<s>
Third-parties	O
offered	O
external	O
LED-based	O
illumination	O
solutions	O
for	O
the	O
HP	B-Device
200LX	I-Device
series	O
of	O
DOS	B-Device
palmtop	B-Operating_System
computers	I-Operating_System
in	O
the	O
late	O
1990s	O
.	O
</s>
<s>
The	O
Dell	O
Latitude	O
ATG	O
series	O
laptops	B-Device
have	O
also	O
contained	O
a	O
pair	O
of	O
red	O
LEDs	O
which	O
are	O
controlled	O
in	O
a	O
very	O
similar	O
way	O
to	O
the	O
IBM	B-Device
ThinkLight	I-Device
and	O
also	O
serve	O
to	O
illuminate	O
the	O
keyboard	B-Device
.	O
</s>
<s>
Some	O
computer	O
manufacturers	O
have	O
opted	O
for	O
backlit	O
keyboards	B-Device
instead	O
of	O
illuminating	O
the	O
keyboard	B-Device
from	O
above	O
;	O
but	O
some	O
ThinkPads	B-Operating_System
included	O
both	O
the	O
ThinkLight	B-Device
and	O
a	O
backlit	O
keyboard	B-Device
(	O
for	O
example	O
,	O
T530	B-Device
,	I-Device
T430	I-Device
and	O
X230	B-Operating_System
models	O
)	O
.	O
</s>
