Well, you may be fine for a lot longer than that 
Most LEDâs have an MTBF of at least 50,000 hours to maybe as much as 100,000 hours. Thats about 2,777 days of veg time or 4,166 days of flower time.
You can run them at close to max spec and still get years of use out of them. Or over drive them by a tiny bit more and they die very rapidly. Its a matter of degree.
Here is a good refference on this.
http://www.radio-electronics.com/info/data/semicond/leds-light-emitting-diodes/lifespan-lifetime-expectancy-mtbf.php
Factors affecting LED lifespan
There are a number of factors that affect the useful LED lifetime. By ensuring that the LED is protected from adverse conditions it is possible to ensure the maximum lifetime is maintained.
Temperature: One of the major issues in ensuring the maximum life is obtained from a LED is keeping the temperature down. Excess temperature will considerably shorten the life. To prevent the LED chip running over temperature there are a number of elements that can be included within the design
Good thermal path from LED chip to mount: It is necessary to ensure that the heat can be effectively removed from the LED semiconductor itself. This is the first step in ensuring the LED junction temperature does not rise to high and adversely affect the LED lifetime.
Good bonding between LED and external mount: It is necessary to ensure that the LED package is effectively bonded to the element on which it is mounted. The thermal resistance should be as low as possible, possibly using thermal mounting grease t ensure complete contact.
Good heatsink: In order that heat is removed effectively from the overall assembly the heatsink on which the LED is mounted should have a low thermal resistance. It should also be located so that heat will flow away from the heatsink. For LED lighting, this is particularly important because often lamps will be located within small light fittings and this will not aid cooling, and hence the LED lifetime will be reduced.
LED drive level: To obtain the best LED lifetime, the LED should be driven well within its ratings. Overdriving a LED will drastically reduce its lifetime, although it will increase the light output.
Power supply: The power supply needs to match the light emitting diode for optimum LED life expectancy. Not only should the voltage be regulated, but the current also needs to be closely controlled to ensure the LED does not run outside its ratings, or even too close to its maximum ratings.
Environment: General conditions such as vibration, and temperature extremes - even when not operating - place mechanical stresses on the diode which will reduce the LED lifetime. Ideally, a LED should be operated within a stable dry environment. When this is not possible, a shorter LED lifetime should be anticipated.
Although it may appear obvious at first sight that the LED life should be as long as possible, this may not always be the main requirement. It is possible that in some cases light output is more important than LED lifetime, and in this case it may be permissible to overdrive the LED to obtain the additional light. Additionally budgetary constraints may limit the inclusion of more effective thermal management, and in this case a decision can be made to balance LED life expectancy against the cost.
