greengrass Posted March 22, 2003 Share Posted March 22, 2003 does annyone know what happens if you use a worn out bulb? I would have thought plant growth would just slow down, but coud it be more serious some how making the plants deficient? could the spectrum some how change? I ask because i only have probs when i move plants from flouros to 250 hps even though i keep the hieght at least 3 ft, I could not say at all how many hours i used the light but i`m pretty sure it`s quite old. surely a worn out bulb would just promote slow growth & not cause defiencys or am i way of with this presumption? all the best gg Link to comment Share on other sites More sharing options...
Joolz Posted March 23, 2003 Share Posted March 23, 2003 Hi Greengrass The intensity output drops as the bulb gets older , a hps lamp should really be renewed every 12 months You said your light is at least 3 ft above your plants , i think thats way too high for a 250w, you could drop that by at least 18 inchs maybe even 2 ft and your plants would definately thank you for it Peace Link to comment Share on other sites More sharing options...
greengrass Posted March 23, 2003 Author Share Posted March 23, 2003 Thanks joolz all the best gg Link to comment Share on other sites More sharing options...
strider Posted March 23, 2003 Share Posted March 23, 2003 If the back of your hand under the bulb isn't uncomfortably warm after a full minute, that distance is OK for the plants. Link to comment Share on other sites More sharing options...
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