Specifications

Design-in guide Philips Fortimo LED Line High Voltage System 28
The NTC is a resistor with a temperature dependent resistance value.
The NTC resistance can be measured in two ways:
1. Directly on the NTC component (R
NTC)
2. Using the onboard JST connector(R
CONN)
In the second method, the resistance of other resistors connected to the
NTC is measured as well. The following table shows the relation between
temperature and measured resistance for both methods.
Temperature
°C
LED Line 2ft 1250lm
2R HV1
LED Line 2ft 2200lm
1R HV1
R
NTC
(Ohm)
R
CONN
(Ohm)
R
NTC
(Ohm)
R
CONN
(Ohm)
0
49221
9656
49221
49611
5
38245
9147
38245
38635
10
29936
8584
29936
30326
15
23613
7981
23613
24003
20
18756
7351
18756
19146
25
15000
6710
15000
15390
30
12074
6073
12074
12464
35
9780
5455
9780
10170
40
7969
4867
7969
8359
45
6531
4320
6531
6921
50
5382
3819
5382
5772
55
4459
3366
4459
4849
60
3713
2962
3713
4103
65
3108
2605
3108
3498
70
2613
2292
2613
3003
75
2208
2019
-
-
80
1873
1782
-
-
Relation between flux and Tc
The flux of the LED Line is specified at a nominal Tc, which is a lower
value than the maximum Tc corresponding to the lifetime specification.
Increasing the temperature lowers the flux and lifetime of the LED Line.
The relation between flux and Tc has been plotted in different graphs on
the left and below
LED Line 1ft 650 lm 3R luminous flux as a function of Tc
LED Line 1ft 1100 lm 3R luminous flux as a function of Tc