What is E-TORL?
The Epson - Twin Optimised Reflection Lamp or "E-TORL" is a projector lamp that features a special elliptically-shaped reflector with an additional sub reflector unit that allow the lamp to achieve an unprecedented 20% improvement in light projection efficiency.
These result in lower power consumption, cooler operation and longer operational life compared to ordinary projector lamps.
Parts of the E-TORL
Elliptically shaped reflector
The lamp and the sub-reflector unit
How Does E-TORL Work?
Ordinary projector lamps typically feature a parabolic (semi-circular) reflector shape that does not efficiently reflect light generated from the lamp's burner element through the projector's optical system. This is because the curvature of the ordinary lamp reflector allows a significant portion of the light to be reflected away from the light path of the optical unit, where it is lost as heat and results in projected images appearing dimmer.
In the E-TORL, the parabolic reflector has been replaced with an elliptically-shaped reflector that reflects light beams to the optical system far more efficiently.
In addition, Epson engineers added a sub-reflector unit to the E-TORL, which further improves efficiency by collecting and channelling the light from the area in centre of the lamp into the optics.
Structural comparison of an ordinary lamp and E-TORL
The E-TORL Advantage
The E-TORL design allows almost 100% of the light from the lamp to be collected and channelled through to the projector's optical system. This enables E-TORL lamps to either be 20% more efficient than a standard lamp of the same power; or smaller than a standard lamp of the same brightness. This reduced size allows Epson to shrink the projector's optical engine, resulting in an overall reduction in the projector's size.
In addition, the E-TORL runs cooler than a standard lamp of similar wattage because the design incorporates an air gap between the reflector and the burner. This cooler operation also enables further benefits:
1) This means that the cooling fan of the projector does not need to spin as fast, further reducing power consumption and noise generation
2) The lamp life is much longer (up to an amazing 6,000 hours in low brightness mode) compared to conventional lamps, helping to save replacement lamp cost and time.