- The intensity of the bulb diminishes with use.
- The filter can accumulate dust, crack or delaminate, which can alter the wavelengths and irradiance of light transmitted.
Light Emitting Diode (LED) curing lights.
These curing lights use light-emitting diodes (LEDs) as a light source and do not require filters. The original LED lights had narrow emission spectrum and low power intensities, necessitating long curing times. This issue was overcome by 2nd generation curing lights with high power intensity. However, they maintained narrow emission spectrum, which restricted them to activate only camphorquinone, and thus could not fully polymerize some composite materials. Third generation curing lights feature broad emission spectrum (380nm to 515nm), along with high irradiance in the range of 1000mW/cm2 and higher, reportedly allowing these lights to light-cure all composites without restriction.
Other advantages include:
- A long lifespan without deterioration of power intensities.
- Low wattage requirement.
- Ability to be battery operated.
- Reduced generation of heat.
- Quiet to operate.