Back to the original T5-HO topic
I have completed my testing; here are the results from my Extech Power Analyzer. Not the most accurate, but good enough for relative comparison.
Ballast is GE 454MVPS90-E maybe a few years old but still reasonably efficient.
4 tubes tested in each case, in the same fixture
GE F54W-T5-850-ECO (also a few years old so not as bright as new ones)
233 Watts PF 0.984 (tubes presumably 54*4 = 216W, rest is ballast - ~8%)
Lunera HN-T5-D-48-25W-850-G2 (nominal 3500 lumens, older G1 is only 3200lm)
114 Watts PF 0.991 ( so about 14W used by this ballast assuming tubes are close to nominal 25W)
MaxLite L24T5SE450-CG (Bypass, line voltage direct into one end, easiest to rewire)
100.6 Watts PF 0.996 (ok, so 0.6W over nominal, probably measurement error)
nominal 25W 3400 lumens each
So these T5 LED tubes both provide more than 50% savings and are brighter than my (aged) fluorescents. I only bothered to replace ballasts where the ballast had gone bad in one or both sections. I was surprised at the small difference between bypass and direct replace. With older non-power factor correcting ballasts I would replace them.
Spreadsheet with details available on request - gavin.perry (at) MeridianLighting (dot) COM
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