Definition of Terms
Bulb - Light source generating ultraviolet, visible, and infrared radiant energy from burning matter stimulated
by electrical power conditioned by a proper power supply which is an integral part of a Lamp. A light source is
usually placed into a Reflector (of various geometry) to increase light source efficiency by collecting and
directing radiant energy of selected spectra (for a given curing process).
Intensity - a measure of energy over the unit of surface area (measured in W/cm
2
or mW/cm
2
). This measure
is also referred to as “irradiance”.
Brightness, also known as Luminance - description of energy in the visible region of the spectrum (approxi-
mately from 400 to 700 nm) and recorded in photometric units. “Intensity” (see below) of visible light energy
is called Luminance.
Luminance - luminous flux (energy of visible light) incident per unit area, and measured in Lx (lux) or Lumen/cm
2
.
Ultraviolet (UV) - The invisible region of the spectrum just beyond the violet end of the visible region.
Wavelength ranges in general from 1.0 to 400 nm. Dymax bulbs (burners) do not radiate energy in deep
ultraviolet; there are very minute amounts below 220 nm and practically nothing can be sensed below 200
nm. This is due to the use of an ozone-blocking quartz-bulb envelope (See Ozone).
◼ Ultraviolet A (UV-A) - UV of long wavelength from within approximately 400 to 320 nm of the spectral
band (4000 to 3200).
◼ Ultraviolet B (UV-B) - UV of medium wavelength from within approximately 320 to 280 nm.
◼ Ultraviolet C (UV-C) - UV of short wavelength below 280 nm (we say from 280 to 200 nm) – a large
amount of this energy is present in the sunlight.
◼ Visible - Light that can be seen 400-700 nm.
Dose - is irradiance integrated over time, or Irradiance (W/cm
2
) x Time (s) = Dose (Joules/cm
2
). Note: Watt is
the power that gives rise to the production of energy at the rate of 1-joule (J) per second (s).
Ozone - oxidizing agent (O
3
) produced by the action of Ultraviolet radiant energy (below 185 nm) or electrical
corona discharge of oxygen on air.
OSHA 1910.145: “Regulation of Accident prevention Signs and Tags” defines the following headers as:
■ Warning – is used when there is a hazardous situation that has some probability of severe injury.
■ Caution - is used to indicate a hazardous situation that may result in minor or moderate injury.
■ Notice - is used to convey a message related directly or indirectly to the safety of personnel, or protection
of property.
OSHA 1910.145: “Regulation de la prevention d’accident Signes et Étiquettes” défin les têtes comme:
◼ Avertissement - est utilisser quand il ya un situation hasardeux qu’il avais de probalilité de se blesser
sévère.
◼ Pre-Caution - est user pour indiquer un situation hasardeux qu’il peut être en consequence en minueur
ou modére blessure.
◼ Attention - est user pour communiquer un message lié directement ou indirectement à la sécurité de
personnel, ou protection de proprieté.
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