![]() ![]() Or maybe you dig the cool striations If the goal is to save energy, use T8 32w lamps, or simply reduce the overall number of T12 lamps you use in a room. Lite White, though those lamps aren't THAT exciting after all). There is just no good reason to use these lamps, unless you have a particularly rare lamp or colour temperature not available in 40w (i.e. I got rid of my last pair of Watt-Misers last weekend. But I always get rid of them and go back to 40 watt lamps. I've tried several times to use and like 34 watt T12 lamps. I agree with DieselNut - ditch the 34w lamps. Re: Using 34 watt t 12 bulbs in ballast that uses 30 watt and 40 watt lamp So from collector point of view it is safer to not do these changes, the old ballasts pieces just happened to survive long only with the F40 tubes. And many ballasts would die anyway, but the F34 is blamed, because the ballast died when F34 was in there. ![]() Now many of them are "just on the edge" - they are weaker (because they were so since manufactured, or they weakened over time), but just not as much to die on F40, but as F34 cause a bit higher current (quite big part of ballasting is in wire resistance on 120V ballasts, so the current depend a bit more on the arc voltage, then use to on the 230V series chokes), what mean higher operating temperature, just tipping them over. ![]() The problem is, then the "old reliable" ballasts are reliable only, because the weaker pieces were already "filtered out" by the test of the time, so remain only pieces capable to run the F40. All "problems" with old ballasts and F34 tubes are, then most of the old ballasts are way past the end of their life (both operating as well as shelf life), so become sensitive to any unusual condition It should be, in the theory, safe and when taking a lot of newly made (really new, not NOS) ballasts of the old type, the ballast failure rate would be practically the same as with F40 (and the same as we see with "unreliable" new ballasts). ![]()
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