Any Way To Tell If Mh Bulb Is Finished?

[dorjewright]

I've got 2 600s eye hortilux MHs. 1, 3 yrs old the other 1 yr. I mixed them up. Both put out about 4500 lumens at 12" (decimal point maybe wrong could be 45000). One I know was used for less than a few weeks. The other of and on for a few years.

 

[MIMedGrower]

They are depleted by 6 months for optimum plant growth.

I have found i can use their super hps for 9 months before i notice plant growth suffering.

 

[PharmHand]

Not sure about the mh but the hortilux SE super HPS hav a date of manufacturing stamped on the glass. Might help if ones newer?