For each half cycle, part of the LED emits light and part is dark, and this is reversed during the next half cycle. The efficacy of this type of HPLED is typically 40 lm/W.[78] A large number of LED elements in series may be able to operate directly from line voltage.
CREE flashlights can be seen in many artistic applications, high-rise architectural structures, street lighting, airports, warehouses, area lighting, parking structures, security lighting and even general lighting for interior spaces such as restaurants and residences. This is because they offer the perfect illumination performance required in these applications and are also economically viable.
