Transcript 308 Berryessa Design..

Berryessa Designs
Mike Ju & Elaine Chang
Who We Are
• We are a lighting design house and
manufacturer with focus on LED based
reading lights.
• Started in 2009, Base in San Jose, California
– Primary production in San Jose
• Our mission statement:
– Quality Products from Quality Designs
Our Primary Market
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Reading lights for low vision
Reading lights for people over 40 (Boomers)
Reading lights for university students
Reading lights for hotel rooms
Reading lights for 12 and under
4 Eye Disorders Affecting People Over 40
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Cataract
Glaucoma
Age Related Macular Degeneration
Diabetic Retinopathy
Appropriate reading light can help. We are
here to help.
Customer Needs
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Some need more light to read
Some feel light is too bright and glary
Some navigate by the shadow of the light
Some eyes changes color preferences through
out the day
We build lights to address the needs of our
customers through light source, optics,
fixtures, and electronics
Key Partners in Low Vision
• 4 State Government Agencies
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Department of Rehab, California
Oregon Commission for the Blind
Montana DPHHS Blind and Low Vision Services
Washington DSB
• Universities
– UCLA, UC Berkeley
– Casey Eye Institute, Portland Oregon
• Low Vision Institutes
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Braille Institute Southern California
Center for Partially Sighted
Earle Baum Institute
Light House San Francisco
LIGHTING BASICS
Lights
• Light have two primary purposes:
1. To illuminate
• Lighting inside a room or a building
• Lighting for reading, writing, craft works etc
2. To indicate
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Signal lights at intersection
Turn signals on an automobile
Bill board lights
Lighted signs
Light Fixture
• Light Fixture for General Illumination
– Light fixture designed to light up an area or a
room
– Examples: ceiling light, wall sconces, recess
lighting, floor lamp, table lamps
• Light Fixture for Task Lighting
– Light fixture designed for a specific task
– Examples: flash light, magnifier lamp, any light
with a targeted lighting area
Light Fixtures for General Illumination
Light Fixtures for Task Lighting
A REVIEW ON LIGHTING
TECHNOLOGY
Popular Lighting Technologies
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Incandescent
Fluorescent
Halogen
LED
Light Sources Technologies and Their Inventors (1)
• Incandescent
– Thomas Edison, carbonized sewing
thread inside a vacuum bulb
– William Coolidge, ductile tungsten bulb
• Fluorescent
– George Inman, Richard Thayer, Eugene
Lemmers, and Willard Roberts developed
the first true fluorescent lamp
(source edisontechcenter.org)
Light Sources Technologies and Their Inventors (2)
• Halogen
– First developed by Elmer Fridrich and
Emmett Wiley
• LED
– James Biard and Gary Pittman, 1st Patent on LED
1966
– Shuji Nakamura, 1st bright blue GaN LED that we
use today.
(source edisontechcenter.org)
Why is LED better than Other Technologies?
• Highest efficacy of the popular technologies
– 80 to 120 Lumens per Watt
• Lower operating voltage, safety
– Typically DC voltage < 40 volts
• No UV
– Compact Fluorescent and Halogen Technologies
emit UV
KEY WORDS IN LIGHTING
Typical Specification of a Bulb
Base typically E26 or E27, E  Edison, 2626mm, 2727mm
A19 shape is designed for 360 degree emination.
Key Words in Lighting
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Efficacy
Lumens
Lux
Correlated Color Temperature CCT
Efficacy – Definition
• In this case, we are talking about luminous
efficacy.
• Efficacy is an efficiency parameter to measure
how well does the light source convert
electrical energy into light.
• It is expressed in volume of light / electrical
power supplied
• Metric Unit is expressed in Lumens / Watt
Efficacy Calculation Example
Total Output is 630 Lumens, Power Consumption is 60 Watts.
Efficacy for this bulb is 10 Lumens/Watt
Typical Efficacy of Different Light Sources
Efficacy is a good way for us to evaluate lighting
technologies.
• Incandescent – 10 to 14.3 lm/W
• Halogen – 10 to 14.4 lm/W
• CFL – 50~70 lm/W
• High Efficacy LED – 80~100 lm/W, and
improving .
What Does It Mean in Terms of Dollars and Sense?
• Typical 60W (14.3 Lumens/Watt) incandescent
light bulb will cost you $2.25 based on
$0.1559 per KWH @ 8 hours per day for 30
days (1 month)
• A 13W (70 Lumens/Watt) CFL bulb will cost
$0.49 to operate in the same period.
• A 12W LED light (80 Lumens/Watt) will cost
$0.45.
Why do we recommend LED not CFL?
• Safety Concern
– CFL runs on AC. LED runs on DC in most cases.
– Human skin protects from voltage up to about 60V. If it is
AC, divide 60V by 2 or less than 30VAC.
• Hazardous Material Concern
– CFL contain traces of mercury. Need proper disposal of the
spent bulb.
• UV Concerns
– CFL emits slight amount of UV at 365nm due to its mercury
vapor.
Lumens – Definition
• Lumens is a measure of total amount of visible
light from a light source.
– A typical 60W incandescent light bulb can produce
800 Lumens of light
– A 13~15W CFL bulb can produce 800 Lumens
– Typical 10.5W A19 Shaped LED bulb from Philips
or Sylvania produces 800 Lumens
Lux - Definition
• Lux is a measurement of brightness. It is
expressed as Lumens / Surface Area.
• It is expressed as Lumens/meter square
• Typical brightness of environment
– Moonless, overcast night sky 0.0001 lux
– Office building 350 to 500 lux
– Sunrise or sunset on a clear day 400 lux
– Full day light, indirect sun 10000 to 25000 lux
Lux vs, Lumens When to use Which Parameter
• When buying a light for general illumination
purpose, it is best to look at number of
Lumens that the light can provide.
• When buying a reading lamp, it is best to look
at the number of Lux that the light can
provide. Be sure to know what distance
between the light source and the intended
object that the lux is measured.
CCT - Definition
• CCT stands for correlated color temperature
• It is the temperature of an ideal black-body
radiator, expressed in the units of degree
Kelvin.
• White light comes in different shades.
– 3000K soft white or warm white
– 4000K neutral white
– 5000K cool white
MacAdams Ellipse & CCTs
• 3000K Soft white or Warm white
• 4000K Neutral White
• 5000K Cool White
Which CCT is Best?
• Each person has a sweet spot or preference
for CCT. Factors depends on heredity, where
you grew up, and most important what eye
conditions do you have.
• It is easier to have individual examine to see
what CCT preference by reading materials
with lamps with different CCTs.
Trends and General Tendencies
• Cataract – lower CCT, longer wavelength
penetrates matters better
• Diabetes – lower CCT with reddish spectrum
• Macular Degeneration – varies, depending on
your heritage and where you grew up
Choose the Right CCT to Improve Contrast
Text Text Text
• During reading, we look for the transition
between the text and the back ground.
Improve contrast will improve effort to read.
• A light with proper CCT is like a good pair of
running shoes. Less effort to read translate to
longer reading period.
GENERAL ILLUMINATION
Importance of Ambient Lighting
• Your eyes constantly monitor the amount of
light in the surrounding and opens pupil
accordingly.
• It is important to maintain appropriate
ambient light to minimize over-exposure of
your retina.
• Key take away point is never read watch TV in
the dark.
Lights Sources
In general, lights can be of point source, line
source and plane source
Examples
• Point source - a light bulb
• Line source: a light tube
• Plane source: a light box or screen made of
OLED, LED, fluorescent tubes
Create Ambient Lighting via General Illumination
• You can use single or multiple light source to
fill the room to create ambient lighting.
• Track light
• Table Lamp
• Cove light
• Ceiling Light
• Floor Lamps
Working together
to create
ambiance
TASK LIGHTING
What Makes a Good Reading Light?
• CCT – Proper CCT, Everyone is Unique
• Brightness – Appropriate Brightness,
Dimmer Option
• Adjustability – Delivery of Light
• Safety – Free from Heat & Electric Shock
• Quality – Longevity of Product
Why is Berryessa Designs Reading Lamp?
• Good thermal management to ensure
longevity of LEDs
• A family of CCT to choose from
• Power management with maximum DC
voltage of 24V + short circuit protection.
Human skin protects from electro-shock up to
60V.
• After sales customer service
Our Products
Elegance
Specifications:
8 High Power LEDs
Energy Consumption 10 Watts
LED Rated Lifespan 40,000 hours to 70%
brightness
Color Temperature (Warm White) 2,600K
~ 3,700K
Transformer (100V ~ 240V, 50/60Hz)
Included – UL/CUL Certified
Light Area Oval
Finish Color Metallic Silver
Height 25” (max), Reach 23” (max), Width
6.75”
Material Steel / Plastic
Cord Color Black
Cord Length 6’
Photometrics (@ Maximum brightness
level)
12” Above Desk - 210 fc
20” Above Desk - 100 fc
Product Warranty 1 Year
Allievo
Specifications:
6 High Power LEDs
Energy Consumption 10 Watts
LED Rated Lifespan 40,000 hours to 70%
brightness
Color Temperature (Warm White) 2,600K ~
3,700K
Transformer (100V ~ 240V, 50/60Hz)
Included – UL/CUL Certified
Light Area Oval
Finish Color Metallic Nickel
Reach 19”
Material Aluminum / Plastic
Cord Color Black
Cord Length 6’
Photometrics (@ Maximum brightness level)
12” Above Desk - 175 fc
Product Warranty 1 Year
USB Power Station
LED Section
6 High Power LEDs (Same as Allievo)
Energy Consumption 10 Watts (LED Portion)
LED Rated Lifespan 40,000 hours to 70%
brightness
Color Temperature (Warm White) 2,600K ~
3,700K
Photometrics (@ Maximum brightness level)
12” Above Desk - 175 fc
USB Charging Section
4 USB Type A Connection supplying Power
Only: 5V, 2A typical
Transformer (100V ~ 240V, 50/60Hz)
Included – UL/CUL Certified
Light Area Oval
Finish Color Options: Metallic Nickel, Black,
Graphite
Reach 19”
Material Aluminum / Plastic
Cord Color Black
Cord Length 6’
Product Warranty 1 Year
Junior Classic
LED Section
• 6 LEDs
• Energy Consumption 8 Watts (LED
Portion)
• LED Rated Lifespan 30,000 hours to 70%
brightness
• Color Temperature 3400K , 3700K, 4100K,
4900~5100K
Transformer (100V ~ 240V, 50/60Hz)
Included – UL/CUL Certified
Light Area: Round
Finish Color Options: Chrome
Max Reach 12”, Max Height 17”
Material: Metal
Cord Color Black
Cord Length 6’
Product Warranty 1 Year
Junior Family
Classic
Flex
Gooseneck
Floor Lamps
Elaine
Julia
Melinda Fluorescent Lamp
• Low Cost
• UL Listed Ballast
• 27W Fluorescent Light
• Available in 2700K, 4100K
CCT
Magnifier Light
• Product Name: Joseph
• Magnification: 2X
• Light Source: LEDs
• CCT Options: 3000K, 4000K,
5000K
• Dimmable using in-line
insertable dimmer
• DC Supply with short circuit
protection
• Designed for reading, knitting,
Sewing, Craft
Magnifier Light in Up Right Position
Magnifier Light Photos
90 Degrees
360 Degrees
• Maximum reach: 20 inches, 90
degrees bend, from center of the post
to middle of the magnifier lens.
• 360 degrees rotation around the post
• Gooseneck for fine lens positioning
• 18 LEDs for even distribution of light
• Low DC voltage to minimize electroshock
Magnifier Light Photos
• One can use this magnifier for visual
inspection of small parts.
• Place a book or newspaper behind the
lens
• Knitting or threading needles
• Remove splinters from hand
• Nail clipping
• Head of magnifier light can rotate 360
degrees.
• Many degrees of freedom in terms of
adjustment to deliver magnified view
from arbitrary angles.
How Bright is Bright?
• It depends on whether it is public space,
private space. Typical office ~ 500 lux and
classrooms ~ 250 Lux minimum.
• Most public spaces are lit with 4000K to
5000K CCT. To most people, this is perfectly
acceptable. To some people, this may be
either too bright or too dark. CCT is a
important function need to be consider along
with illuminance.
What to Do When Existing General
Illumination is Not Comfortable?
Cater the needs of each individual through analysis of
CCT and illuminance needed.
1. Identify the CCT that the individual is most
comfortable with in his or her individual space.
2. Measure illuminance needed in tha space for the
individual to be at ease.
3. Replace general illumination light source or add
additional task lighting to create environment.
How to Identify CCT, Measure
Illuminance?
Possible Solution:
1. Professional Light Meter to measure CCT and
Illuminance with Proper Light Sources at set
distance.
2. Proper light sources with known CCTs at a set
distance to measure Illuminance with
adjustable dimmer for brightness control.
Use and record brightness reading from
photosensors of tablets or smart phones.
Apps for Light Measurement
• Apps for Smart Phones and Tablets can give a quick
measurement of lights.
– The apps can provide marker readings to provide trends
and directions towards the lighting condition desired.
• Google Play Store: search for light meter
– Light Meter, a good app with calibration parameters for
illuminance and CCT adjustments.
• Apple Apps Store
– Light meter apps with no calibration control, no confidence
in data measured
Values of These Mobile Apps
• Although mobile lighting apps are not precise in
comparison to professional equipment, the readings
made using apps can serve as markers in terms of
light intensity and CCT.
• By using different known CCT light sources for color
metamerism, mobile lighting apps can show
direction trend about where the client prefers in
terms of CCT.
• By using dimming capability of LED bulb to adjust
intensity, mobile lighting apps can reveal where
intensity of the light needs to be.
Simple Techniqut to Identify
CCT Preference (1)
• Material Needed
– Reference: a 60W LED Bulb with 3000K CCT
– Reference: a 60W LED Bulb with 5000K CCT
• Read the label off the box. Each bulb should provide
approximately 800 lumens. We can choose other
lumenous flux as long as both are the same.
• Choose dimmable LED bulbs for intensity control
Simple Techniqut to Identify
CCT Preference (2)
• Choose bulb with 3000K CCT, illuminate the reading
material at 12 inches away from the reading
material. Record the illuminance as ICal. Label as 12
inch Reference for 3000K or D3K-Cal
• Gradually move the lamp either towards or away
from the reading material until the text is legible to
the client.
• Record down CCT and illuminance I3K from the
mobile lighting app. Also record the distance
between the lamp and the reading material as D3K
Simple Techniqut to Identify
CCT Preference (3)
• Gradually move the light source of 5000K CCT bulb
either away or towards the reading material until the
mobile lighting app reads the illuminance number as
the 3000K CCT Bulb ICal. Record the distance as D5KCal
• Gradually move the lamp either towards or away
from the reading material until the text is legible to
the client.
Simple Techniqut to Identify
CCT Preference (4)
• Record down CCT and illuminance I5Kfrom the mobile
lighting app. Also record the distance between the
lamp and the reading material D5K
• Compare 12 inch Reference for 3000K distance to
Equal Illuminance Distance (5000K) to see which
bulb has higher luminous flux.
• Not all bulbs are created equal. We use ICal, D3K-Cal,
and D5K-Cal as a way to calibrate out differences in
bulb output.
Simple Analysis (1)
• Ask the client to see which color does he or
she see less glare with. If glare is not an issue,
we will evaluate distance measured.
• Calculate using the following formulas:
I5KPrime = ICal* (D5K-Cal/D5K)2
I3KPrime = ICal* (D3K-Cal/D3K)2
• Compare the two numbers above, choose CCT
of lessor of two numbers.
Simple Analysis (2)
• The choose CCT hints the direction of
preference.
• It is possible to choose a third CCT bulb such
as 4000K to rerun the exercise to further
narrow down CCT preference.
Junior Gooseneck 3-1 with Dimmer
• 3 built in light sources: 3000K,
4000K, 5000K
• With in-line adjustable dimmer to
control intensity of the lamp.
• Can operate with rechargeable
battery pack for portability
Can help narrow down client’s
CCT preference and illuminux
flux rapidly
PORTABLE TASK LAMPS
Key Considerations for Portable Lamps
• Brightness and beam pattern – Public Spaces are often too
dark for people with low vision. Additional lighting is needed.
Brightness needs to bright enough yet not intrusive to others.
Same goes with beam pattern of portable lamp, not to invade
other people’s space.
• Color Temperature – Most portable lights are built with very
high CCT, > 5500K to conserve power consumption
• Hours of Operation – Depending types of battery. Voltage and
current differs from one technology to the next.
• Weight – portable often becomes luggable due to operating
time constraint. Is it too heavy to carry?
Types of Batteries
Disposable
• Alkaline
• Zinc Carbon
Rechargeable
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Lead Acid
NiCd
NiMH
Lithium Ion
Lithium Polyer
Lithium Ion & Lithium have Higher Nominal
Cell Voltage
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Lead Acid – 2.35V when fully charged
NiCd - 1.5V when fully charged
NiMH - 1.4V when fully charged
Lithium Ion - 4.1V when fully charged
Lithium Ion Polymer - 4.2V when fully charged
Size and Weight Comparison of
Rechargeable Batteries
Source: http://www.houseofbatteries.com/custom-batteries-c-1-l-en.html
Advantages and Limitations of Lithium
Batteries
Advantages
• Higher energy density, no memory issue, no scheduled
cycling, low self-discharge current
• Higher cell voltage means less number of cells
– For USB application, need only two cells in series
– For most microelectronics, single cell will suffice
Disadvantages
• Aging – start to degrade after a number of cycles
• Need additional circuits for power and thermal management
• Consequence of: over-charge over-discharge, and short
circuit
Thank You