abalone

anyone knows where to get iwaki pumps? i thinking of getting iwaki wmd-20rxt. 3120l/h only 20watt but iwaki md70 no good, 186watt. should use dolphin amp3000 only 50 watt

If you are talking about Photosynthetically Active Radiation. Some fluorescent wins MH hands down. faq0017_0800.pdf

You are right. Electronic ballast is the only choice. "................. Table 1: Recommended characteristics for electronic ballasts The following guidelines apply to general lighting applications. A qualified lighting designer should be consulted for specific installations. Recommendation Power factor Minimum 0.95 Current crest factor Maximum 1.7 Total harmonic distortion Maximum 20% Frequency Minimum 20kHz Transient protection Category A, IEEE 587 Sound rating "A" Flicker factor Maximum 5% Ballast factor Minimum 0.88, unless exceptionally low light is required. Maximum 1.20 History Two years of production and documented performance, or satisfactory performance in an on-site pilot project. Warranty Minimum 3 years, including a $10 per unit labor allowance for failed ballasts. ..............." This is getting too tough right? Time to sleep.........

More data then Conclusion ? You probably got the wrong tube. get T8 or T5 with instant start and/or rare earth. Dont get halophosphor. Dont get high out. Then, after 10000hrs, you still have 90% or slightly less of the original rated lumens!!!

Let's get some data T5 lifespan not that great ??? At the worst lifespan of 10,000 hrs, if you on it for 8 hrs daily, it will last 3.425 years. But 10,000hrs is based on 3 hrs, not 8. So it should last longer.

Sometimes you hope you don't know so much. Makes your life more difficult when it comes to choosing the best. Since you ask for it, here it is.

Save the money. T5 & T8 only slight difference. Might as well add 1 more T8 tube ldlnews_2003_winter.pdf

T5 better than T8 & T8 better than MH. MH seems better because no one ever compare 10 tubes of T5-40w or T8-40w with 1 MH-400w. But T8 is the cheapest of all!!! ldlnews_2003_winter.pdf