FSG-W1-SSP5-H - FRAEN

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1/7 FSG series lenses for Seoul P4 LEDs

FSG Lens Series

for SEOUL SEMICONDUCTOR Z-POWER P4

TM

LEDs



Narrow peak



High efficiency



4 beams available

The FSG lens offers lenses specifically

designed for the Z-Power® P4 series

LEDs from Seoul.

A software-optimized aspheric profile

enables the generation of different beam

output patterns: narrow, medium, wide,

and elliptical patterns.

The high collection efficiency reaches

85% of the total flux emitted by the LEDs.

Typical applications are:

• Portable Lighting

• Reading Lamps

• Signs

• Architectural Lighting

• Street Lights

Z-Power® is a trademark of Seoul Semiconductor. For

technical specification on LEDs please refer to the Z-Power

datasheet or visit

www.seoulsemiconductor.com

FRAEN CORPORATION FRAEN S.r.l.

80 Newcrossing Road Via Stelvio, 12

Reading, MA 01867 20019 Settimo M. (MI) – Italy

Phone: 781.205.5300 Phone: +39-02-35.456.1

Fax: 781.942.2426 Fax: +39-02-335.456.239

optics@fraen.com info@fraen.com

Website: www.fraensrl.com

For ordering information, please contact:

NAFTA Countries

ARROW

Telephone: 1-888-9LIGHT1

email: lightingsolutions@arrow.com

European Countries Please contact Fraen S.r.l. for

distributor’s information

Email: info@fraen.com

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2/7 FSG series lenses for Seoul P4 LEDs

General Characteristics

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Lens Material

Holder Material

Operating Temperature range

Storage Temperature range

Optical Grade PMMA

PC, black color

-40deg C / + 80 deg C

Average transmittance in visible spectrum (400 – 700nm) >90%, as measured using 3mm thick

Optical Grade PMMA.

Please note that flow lines and weld lines on the external surfaces of the lenses are acceptable

if the optical performance of the lens is within the specification described in the section

“OPTICAL CHARACTERISTICS”

IMPORTANT NOTE – Lenses handling and cleaning:

• Handling: Always use gloves to handle lenses and/or handle the lenses only by the

flange. Never touch the outside surfaces of the lenses with fingers; finger oils and

contamination will absorb or refract light.

• Cleaning: Clean lenses only if necessary. Use only soap and water to clean the

surfaces and lenses. Never expose the lenses to solvents such as alcohol, as it will

damage the plastic.

Scope

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This datasheet provides information about the following FSG series lenses.

Lens alone:

• FSG-N1-SSP4-0R

• FSG-M1-SSP4-0R

• FSG-W1-SSP4-0R

• FSG-E1-SSP4-0R

Lens and holder (assembly):

• FSG-N1-SSP4-HR

• FSG-M1-SSP4-HR

• FSG-W1-SSP4-HR

• FSG-E1-SSP4-HR

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3/7 FSG series lenses for Seoul P4 LEDs

Optical Characteristics – Beam Angle (degrees, Full Angle)

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Lens Part Number

Type of lens Cool

White Warm

White

Blue

Green

Red

FSG-N1-SSP4-HR Narrow beam 6 * 6 5 6

FSG-M1-SSP4-HR Medium beam 24 * 24 23 23

FSG-W1-SSP4-HR Wide beam 37 * 37 37 38

FSG-E1-SSP4-HR Elliptical beam 14 x 32 * * * *

(1) The typical divergence varies with LED color due to different chip size and chip position tolerance. The

typical total divergence is the full angle measured where the luminous intensity is half of the peak value.

Optical Characteristics – On-Axis Intensity (candela/lumen)

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Lens Part Number

Type of lens Cool

White Warm

White

Blue

Green

Red

FSG-N1-SSP4-HR Narrow beam 31 * 32 37 29

FSG-M1-SSP4-HR Medium beam 3.5 * 3.1 4.2 4.0

FSG-W1-SSP4-HR Wide beam 1.6 * 1.3 1.8 1.7

FSG-E1-SSP4-HR Elliptical beam 3.1 * * * *

(2) To calculate the on-axis intensity, multiply the on-axis efficiency of the lens (cd/lm) by the total flux of the

Seoul P4 LED used. See “Illumination Calculations” below. For more detail on flux binning please check the

Seoul P4 LED datasheet at http://www.seoulsemicon.com/en/product/prd/zpowerLEDp4.asp

(3) Luminous intensity depends on the flux binning and tolerances of the LEDs. Please refer to the Seoul P4

LED datasheet for more details on flux binning and mechanical tolerances.

(4) Typical illuminance was measured in candela per lumen with typical Seoul

P4 LED. To estimate the

illuminance in lux, multiply the typical illuminance by the flux (lumens) of your LED. See “Illumination

Calculations” below.

* Configuration not yet measured.

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4/7 FSG series lenses for Seoul P4 LEDs

I

llumination Calculations

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To calculate peak candela: Find the central spot “on-axis intensity” value in the table above, then

multiply this value by the lumens output from your LED (refer to the P4 LED datasheet

http://www.seoulsemicon.com/en/product/prd/zpowerLEDp4.asp for nominal lumens values). Or for a

more accurate value, refer to their .pdf spec for intensity binning.

Example calculation:

If the Fraen narrow beam lens FSG-N1-SSP4-0R is used on a cool (“pure”) white Seoul P4 LED at 350

mA, the typical luminous flux of the LED is 80 lumens:

The calculation is: (31 candela/lumen) x (80 lumens) = 2480 candela peak on-axis.

The beam angle specified in the table above is 6 degrees full beam-width measured at half-peak. This

means at 3 degrees off-axis (half of 6 degrees), the intensity should be half of 2480 candela, or 1240

candelas.

1 candela at 1-meter distance produces 1 Lux. This means the peak intensity at 1 meter will be 2480

lux. The intensity decreases as a function of the distance squared, so at 2 meters the peak intensity

will be 2480 / (2

2

) = 620 lux. At 3 meters distance, the peak intensity will be 2480 / (3

2

) = 276 lux.

Mechanical Characteristics

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Figure 1. Identifying the lenses by their front views

FSG-N1-SSP4-HR

FSG-M1-SSP4-HR

FSG-W1-SSP4-HR FSG-E1-SSP4-HR

Continued on next page…

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5/7 FSG series lenses for Seoul P4 LEDs

Figure 2. Correct vertical distance between FSG lens and Seoul P4 LED

Figure 3. Elliptical beam orientation

The lens is correctly positioned as shown in the figure below. The Fraen lens touches the LED

package, but not the LED dome lens. The Fraen lens is self-centering on the LED package.

Tolerances: +/

-

0.2 mm

FSG-E1-SSP4-0R

NOTE: The elliptical beam lens

produces a beam shape

that is perpendicular to the

microlens pattern on the

output face of the lens. It is

important to consider the

orientation of the LEDs and

the desired elliptical beam

orientation when designing

the printed circuit board

layout.

To produce a horizontal elliptical beam, the lens needs to be

orientated such that the micro-lenses are positioned vertically.

The LED orientation on the PC board should be coordinated

with the beam orientation.

Elliptical beam

is horizontal. The

gate is at 45

degrees.

The micro-lens

pattern is vertical.

Slot in lens

for LED wires

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6/7 FSG series lenses for Seoul P4 LEDs

Figure 4. Installation of lens assembly onto Seoul LED

Figure 5. Overall dimensions of FSG-_1-SSP4-HR series lens assemblies

For installation onto a printed circuit board, holes thru the PCB will allow the legs of the holder to protrude

through the PCB and can be heat-staked or glued in place. See Fraen Application Note FAN-01EN

http://www.fraensrl.com/images/FRN_FHSLenses_HeatStake.pdf The lens assembly can be secured to

the PC board by using glue or silicone RTV. To avoid glue on the lens and LED, apply it only on the legs

of the lens holder.

CAUTION: Do not use instant glue (containing cyanoacrylates). Always test the glue on a sample

assembly and check the results and performance 24 hours later. Some adhesives produce

fumes that will damage the surfaces of the plastic lens, lens holder, or LED.

FSG-E1-SSP4-HR

Tolerances: +/

-

0.2 mm

Slots in lens

for LED wires

∅

30.4 mm

31.6

23.9 mm

□18 mm

PCB thru-hole size and

pattern for holder legs

∅ 3.5 to 3.6 thru

(4 places)

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7/7 FSG series lenses for Seoul P4 LEDs

Ordering part numbers

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FSG-_1-SSP4-__

Published by Fraen Corporation.

All data contained in this document is the property of Fraen Corporation and may change without notice.

Rev Date Author Description

00 08 December 2008 C. Jones Initial Release

0R: Lens alone (no holder)

HR: Lens with white PC holder

N: Narrow beam

M: Medium beam

W: Wide beam

E: Elliptical beam Caution: The orientation of the

elliptical beam lens is controlled

by the slot on the bottom of the

lens (see Figure 3 and 4).