Second hand bulbs...

[jimbojones5678]

Is there a way to tell how much output a used bulb has left? Is there certain signs that say it's dying?

 

Jimbo

[Frazz]

Nope, there's no way known just looking at them and they still light up bright after 3yrs but arent very good to grow with.. and there is a shitload of difference in plant growth between old worn globe and new globe ..

 

just my experiences with globes

 

[DownUnderDoper]

can't wait for the day a globe is invented with an inbuilt timer

[stonedstump]

You can buy a meter to measure light output.

 

I forget the name of them now..

[Luke Skywalker]

Lux meter. Good ones aren't cheap. Not a true measure of the lamps output, but about as reasonable a measure as you can use for testing age and intensity of old lamps.

 

Take em to a hydro shop and ask em to test it against a new one for ya. (might have to call some to find out if they have a lux meter for testing) Best to use fresh globes though, the diff between one grow with an old lamp and another with a new one is huge.