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would someone know why an 40 cw lamp would be labeled not for residential use? THANKS GEO

It may have to do with the marketing of the product. The price and packaging are different for commercial vs. residential. Guess which one has the higher price?

GEO,

I see that the inexpensive shoplite fixtures being sold now use 25w Bulbs. That may be the reason.

Bill

THANKS GUYS! IT WAS A STRANGE LABEL?

[This message has been edited by GEO (edited 12-29-2003).]

ok for the F40 cw bulbs are ratied with high power factor ballast and try to run in the shop light. will result dimmer light and overheating ballast. and majorty of commercal lumaires have hpf ballast in there allready and really check the label to see what the F40T12 CW can take or not. some big box store do carry F40T12 but not in cw format will have diffrent format and the F40 will be labeled for full 40 watts or 34 depending on type of bulb itself. yes of course i do see few F40 in 25 watts format too that mainaly in shop lite and some redestail lumaires .


merci, marc

THANKS MUCH, THAT IS SOMETHING THAT MAKES SENSE. PEACE GEO

Here in CA:
We used 34 watt T-12 lamps on commercial work for quite a while, to comply with our energy saving Code (Title 24)
Any new work, we use electronic ballasts with T-8 lamps (and now, T-5 is the up & coming thing).

BTW, the number assigned to a lamp is a reference to its diameter.
1/8"=1, therefore T12=1-1/2", a T-8=1", T-5=5/8", etc.
The T=tubular
CW is only the color of the bulb...Cool White, which is generally 41K, is an intermediate color.
"Daylight" lamps, @ 50-51K, might look "blue", but are actually close to daylight.
There are lamps made @ 27K, to soothe the eye of those that are used to "soft white".


[This message has been edited by electure (edited 12-30-2003).]

To expand a little on electures good info.

This 1/8 of inch system is also used with other lamps.

A PAR 38 is a Parabolic reflector lamp 38 - 1/8"s across.

A R40 is a simple reflector lamp 40 - 1/8"s across.

Just recently I ran into T-5 high output lamps on dimming ballasts, had to replace the ballast, not cheap.