solarmeter and cards

[NicoleMolina]

I see so the card changes even with webt the fixture is on and no uvb comes out. ?

 

[nightanole]

I see so the card changes even with webt the fixture is on and no uvb comes out. ?

No but the card can change long after the useful life of the bulb. If the bulb is down to .5uvi, the card will still change just as much as when the bulb was new (3.0uvi). The card will only stop changing when the bulb starts nearing zero UVB.

 

[Reptar313]

They really are useless