Page 22 - Sec 61

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61 LIGHT & FLASHLIGHT

ไฟฉายนิรภัย SAFETY FLASHLIGHT

หัวใจสำคัญของแสงสวางจากไฟฉาย PETZL

Brightness or burn time:
A question of balance
Brightness and burn time are two inextricably linked parameters of any headlamp, regardless of its lighting technology.
For a given quantity of energy, increasing the brightness automatically decreases burn time, and vice versa.

Note:
For a compact headlamp worn
entirely on the head, the energy
Di erent ways to source (standard or rechargeable
battery) has a limited capacity in
use the available order to reduce size and weight
for the sake of comfort. In spite
energy according to Brightness Burn time of the improved performance
usage (lumens) (hours) of today's LEDs and batteries,
this still limits the capacity of
a headlamp to provide both
Headlamp energy source: signi cant brightness and long
- batteries or burn time.
- integrated rechargeable
battery Favoring brightness to the Favoring burn time to the
detriment of burn time detriment of brightness
Lighting power: the shape of the beam directly a ects lighting
Brightness CONSTANT LIGHTING distance.
STANDARD LIGHTING Lighting distance depends directly on lighting power, but mainly on the
shape of the beam.
Note:
It is not possible to directly compare the In fact, given the same light output, lighting distance will di er depending
Initial light lighting performance of CONSTANT LIGHTING on the shape of the beam. For example, 100 lumens of light will project to
headlamps (guaranteed light output over a given
output 40 meters with a very wide beam, but up to 100 meters with a narrow
length of time) with that of STANDARD LIGHTING
Guaranteed burn time headlamps (high but brief initial light output). beam.
Guaranteed
light output
Reserve lighting 100 lumens 40 m

t = 0 Burn time
100 lumens 100 m

Managing energy:
di erent approaches ความแตกตางของพลังงานไฟฉายที่ถูกนำไปใชงานของไฟฉาย
A headlamp's energy source can be managed in a number of ways.

ไฟฉายทั่วไป
ไฟฉาย PETZL

STANDARD LIGHTING ใหแสงสวางลดลงตามพลังงาน CONSTANT LIGHTING ใหความสองสวางแบบตอเน�อง
Principle: the headlamp supplies energy "directly" to the light source Principle: the headlamp has an integrated electronic regulation system

• Light output decreases progressively as the energy source discharges. • Light output is constant during a predetermined period. The duration
The headlamp light is very intense for the rst minutes, and then corresponds to true usable burn time (and does not include reserve
decreases gradually over time lighting)
• Constant lighting allows the light output measured during this period to
• The rated brightness is the maximum light output, measured when the be speci ed. This is the guaranteed brightness
lamp is rst turned on. This is the initial light output
• Most regulated headlamps move to reserve lighting mode when the
Notes: energy source is nearly depleted (up to several dozen hours for certain
- the greater the initial brightness of a STANDARD LIGHTING headlamp, products)
the faster it decreases
- when the performance ratings indicate a very high brightness with a very Notes: To obtain 100 lumens of brightness for 50 hours, for example, the
long burn time, one must be aware that these gures often correspond to equivalent of 75 AAA batteries would be required, translating to 1.1 kg on
light output in maximum mode and to burn time in minimum mode. These the head! Therefore, Petzl recommends that the user use caution when
two characteristics can not be obtained simultaneously interpreting the impressive lighting performance claims made for some
headlamps.
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