but how much longer does any one have expierence with useing them ,,,,,,,,thanks for any help

I read its every 3 grows with normal ballast so abotu every 9 months ...?

just checking the lumatek website



and





Doesnt look like they last that long does it ... hey ho ... even though they suppossed to last a lot longer I'd still be inclined to change mine at least once a year even though Im using a digital ballast