Re: [APD] 20 watt bulbs where min 25 watt go

[Wright Huntley <whuntley at verizon_net>]

There is more than a little difference between the tubes being 
discussed. The 4' 25W T-12 shop lights are not even similar to the 2' 
20W T-12 tubes. Scott's suggestion, to find the right ballast, is a very 
good one.

Different length and diameter tubes have different gas mixes to set 
their operating parameters to match a given ballast. Mix and match at 
your own peril.

Tubes come in Rapid Start (RS), Instant start (IS) and regular. 
Different ballasts are called for. The 24" tubes probably need a 
physical starter (small aluminum can with 2 terminals), as well as a 
magnetic ballast. That's the old regular way of doing things. All 
available at any ACE Hardware.

No one puts any money in 24" T-12s any more, because they are so damned 
inefficient in a hood. Go to T-8, or (better) T-5, or (best) CF, with a 
premium-grade reflector, and use less Watts for way more useful 
lighting. Use the right model of Fulham Workhorse o/e electronic ballast 
with them.

Many tubes will start (and work) OK as Instant Start with an electronic 
balla$t. :-) You usually cannot hang two in series, for the starter 
filaments will not be activated, properly.

Get some good advice from a major lighting distributor or a licensed 
contractor who knows what he is doing (caution, many don't in the 
fluorescent business!). Otherwise, heed Scott and buy matching 
components, or get a good retrofit kit from AH Supply.

Wright

--
Wright Huntley -- 760 872-3995 -- Rt. 001 Box K36, Bishop CA 93514

"If people are basically evil, the last thing you'd want is a big
government staffed by those evil folks exercising control over you."
  -- David Bergland


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