When to buy??

[NcsuAE]

When do most of you decide it's time to get replacement MH bulbs? Are there warning signs or do you normally just replace at the 8-12 month mark?

 

[michaeldaly]

Normally 8- 12 months, but they could last longer depending on the brand. You willl also gradually notice a shift in colour as they age.

Ideally you could buy a par meter and test them so you will know exactly when they need replacement.