Lifespan of MH Lights

[cbong]

I have been using the MH bulbs for a year now and wonder if it is time to change it. Plants are still bubbling well though. Pls advice on when to change. Thanks

[tawauboy]

if it is working well, why change it.
remember, "if it ain't broken, don't fix it".
saves you some money too.

[BFG]

I agree. Or if you are itching to buy a new bulb, get it and let the bulb run in it's 1st 50hr or so running in period and then store that new bulb until the old ones burn out.

[loupgarou]

I ran my first set of bulbs for 2-3 plus years..