SYSTEMS DIVISION
LL07 RANGE
MINIATURE FLUORESCENT BULBS
Semelab plc
Telephone (01455) 556565
Fax (01455) 552612.
E-mail: sales@semelab.co.uk
Web site: http://www.semelab.co.uk
Prelim. 10/98
Semelab Plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. No responsibility is assumed for the use of
information contained herein, nor for any infringement of patent or rights of others that may result from such use. No license is granted by implication or otherwise
under any patent or patent right of Semelab Plc.
THE LL07 RANGE OF MINIATURE
FLUORESCENT BULBS
APPLICATIONS:
MEDICAL INSTRUMENTS
METROLOGY
ILLUMINATION ENGINEERING
FLUORESCENT / PHOSPHORESCENT
MEASUREMENTS
ENVIRONMENTAL MONITORING
FEATURES:
SMALL SIZE
WIDE RANGE OF SPECTRAL OUTPUTS:
UV,BLUE, WHITE, GREEN, AND RED
LOW VOLTAGE SUPPLY
HIGH RADIANT INTENSITY
HIGH MODULATION FREQUENCY
LONG LIFE TIME
LOW COST
MECHANICAL DATA
Dimensions in mm
Anode
Electrons
Heated
Cathode
5.3V
Mercury
Atoms
Phosphor
Coating
24V
1KOhm
DESCRIPTION
The LLO7 devices are a range of miniature fluorescent bulbs. The device structure has been designed to give maximum
radiant intensity with low voltage operation.
The principal difference between the miniature and a conventional fluorescent lamp is the filament cathode. When
powered up, electrons are emitted from the cathode by thermionic emission. These electrons are then accelerated towards
the anode due to the potential difference between the anode and cathode. The electrons collide with mercury atoms and
excite an orbital electron. The electron decays to a lower energy level and emits a photon of short wavelength ultra-violet
light. This photon stimulates the phosphor coating on the inside of the glass bulb.
Depending on the type of phosphor used red, green, blue, white or long wavelength ultra-violet light is emitted from the
device. The short wavelength ultra-violet light is absorbed by the glass bulb. See diagram.
The dimensions are subject to a typical tolerance of +0.5mm. Advice on suitable materials to encapsulate the bulbs is
available from Semelab Plc.
Anode
Cathodes
11.0
6.0
16.5
39.0
5.0
7.0
SPECIFICATIONS
(At 25C unless otherwise stated)
The electrical specifications tabulated below are a brief summary and are applicable to all the devices. For information
concerning the tolerances of the stated drive voltages and the subsequent effect on the spectral properties of the device
contact Semelab Plc..
Notes
1. Anode current measured for anode to cathode voltage of 24V, cathode voltage of 5.3V and an anode resistance of
1Kohm.
2. Cathode current measured for cathode voltage of 5.3V and anode to cathode voltage of 0V.
SYSTEMS DIVISION
LL07 RANGE
MINIATURE FLUORESCENT BULBS
Semelab plc
Telephone (01455) 556565
Fax (01455) 552612.
E-mail: sales@semelab.co.uk
Web site: http://www.semelab.co.uk.
Prelim. 10/98
Semelab Plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. No responsibility is assumed for the use of
information contained herein, nor for any infringement of patent or rights of others that may result from such use. No license is granted by implication or otherwise
under any patent or patent right of Semelab Plc.
Parameter
Minimum
Typical
Maximum
Notes
Unit
Anode Voltage
23
24
25
V
Anode Current
11.5
13.0
14.5
1
mA
Anode Resistance
990
1000
1010
*
Cathode Voltage
5.2
5.3
5.4
V
Cathode Current
39
43
47
2
mA
Bulb Wall Temperature
40
60
70
3
*C
Spectral Plot of Red
Fl
0
20
40
60
80
100
200
300
400
500
600
700
800
Wavelength (nm)
R
e
l
a
tiv
e
I
n
te
ns
ity
(%
)
Spectral Plot of Green
Fl
0
20
40
60
80
100
200
300
400
500
600
700
800
Wavelength (nm)
R
e
l
a
tiv
e
I
n
te
ns
ity
(%
)
Spectral Plot of Blue
Fl
0
20
40
60
80
100
200
300
400
500
600
700
800
Wavelength (nm)
R
e
l
a
tiv
e
I
n
te
ns
ity
(%
)
Spectral Plot of Ultra-violet
Fl
0
20
40
60
80
100
200
300
400
500
600
700
800
Wavelength (nm)
R
e
l
a
tiv
e
I
n
te
ns
ity
(%
)
Optical Characteristic
Ultra-violet
White
Blue
Green
Red
Unit
Part Number
LL07UV
LL07W
LL07B
LL07G
LL07R
Luminance
(peak value)
3900
1600
7000
2700
cd/m2
Radiant Intensity
2.7
mW/sr
Chromaticity
x
0.290
0.130
0.223
0.572
y
0.350
0.075
0.645
0.310
SYSTEMS DIVISION
LL07 RANGE
MINIATURE FLUORESCENT BULBS
Semelab plc
Telephone (01455) 556565
Fax (01455) 552612.
E-mail: sales@semelab.co.uk
Web site: http://www.semelab.co.uk.
Prelim. 10/98
Semelab Plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. No responsibility is assumed for the use of
information contained herein, nor for any infringement of patent or rights of others that may result from such use. No license is granted by implication or otherwise
under any patent or patent right of Semelab Plc.
Spectral Plot of White
Fl
0
20
40
60
80
100
200
300
400
500
600
700
800
Wavelength (nm)
R
e
l
a
tiv
e
I
n
te
ns
ity
(%
)
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