Differences In Light Bulbs?

 
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Old 02-08-2011, 06:36 PM   #1
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Differences In Light Bulbs?


What is the difference between full spectrum bulbs and daylight bulbs? Got this question from a customer today and didn't know the answer. They told me they needed "full spectrum day light bulbs" When I went to the supplier the counter geek didn't know either. Supose to find out for me too and let me know.

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Old 02-08-2011, 06:41 PM   #2
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Re: Differences In Light Bulbs?


Full spectrum means the light output is designed to closely mimic natural sunlight. Used a lot with aquariums.

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Old 02-08-2011, 06:41 PM   #3
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Re: Differences In Light Bulbs?


Good question, But I dunno
Can't wait to find out?
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Old 02-08-2011, 06:47 PM   #4
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Re: Differences In Light Bulbs?


BTW, they'll be labeled as that..... "full spectrum"
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Old 02-08-2011, 06:47 PM   #5
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Re: Differences In Light Bulbs?


Full Spectrum bulbs have multiple phosphors that do a good job is simulating natural sunlight. The Rating is called the CRI. The sun has a CRI of 100. A good full spectrum bulb will have a 93+ rating and a temperature greater that 5500K.

Daylight bulbs are usually 6000K-7000K and have a bluish hint. They use less phosphors (usually 3) and the CRI rating is under 85

http://nemesis.lonestar.org/referenc...ent/lamps.html
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Old 02-08-2011, 07:02 PM   #6
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Re: Differences In Light Bulbs?


SO why the difference? Day light bilbs are supose to mimic daylight, but you say full spectrum lights do it better.

This is going into a commercial winery and green house. Not grow lights but general lighting. The regular bulb turn the wine brown. This is comeing from the wine guy.

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Old 02-08-2011, 07:05 PM   #7
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Re: Differences In Light Bulbs?


Daylight is old school phosphors and Full Spectrum is new tech.
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Old 02-16-2011, 06:49 PM   #8
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Re: Differences In Light Bulbs?


Ok so I put the Day light bulbs in as customer liked the light better.
He asked if I could make it any brighter. Right now there are 207 lumens a SQF. That is a crap load of light, you get a damn tan when they are are on. 12'x15' room with 16 4' t8 32w bulbs. Should I just get some 64w bulbs and see what he says or add more fixtures?

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Old 02-16-2011, 06:59 PM   #9
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Re: Differences In Light Bulbs?


You can't just slap in larger wattage bulbs. You need to get a new ballast.
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Old 02-16-2011, 07:16 PM   #10
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Re: Differences In Light Bulbs?


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You can't just slap in larger wattage bulbs. You need to get a new ballast.
I thought of that after I posted. Maybe I should just tell him not with out buying more fixtures. It is to the contract right now to a T. It's so freaking bright in that room, maybe he just like's looking into the sun.
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Old 02-16-2011, 07:19 PM   #11
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Re: Differences In Light Bulbs?


So when does the cannabis farm get rolling.
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Old 02-16-2011, 07:24 PM   #12
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Re: Differences In Light Bulbs?


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So when does the cannabis farm get rolling.
If that was the case they should of used the full spectrum.
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Old 02-16-2011, 10:19 PM   #13
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Re: Differences In Light Bulbs?


In 21 years I have never had this question asked before.


Leo, you do some of the finest carpentry I've ever seen, how on earth do you know so much about light bulbs?
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Old 02-16-2011, 10:32 PM   #14
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Re: Differences In Light Bulbs?


T8, 5000k, 82-85 CRI, is a very clean, crisp, bright light.
If someone needs anymore than this it is for an extremely specialized situation.
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Old 02-16-2011, 10:42 PM   #15
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Re: Differences In Light Bulbs?


Thank you.

And my shop has lights. It originally had 2 400w sodium lights. Vile looking orange light totally unconducive to trying to determine true color. It took me 2 years before I figured out what I wanted/needed. Lots of investigation. I settled on 54wHO T5 5900K 4' x 6 bulb hi bay fixtures with a CRI of 93+.
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Old 02-16-2011, 10:45 PM   #16
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Re: Differences In Light Bulbs?


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Thank you.

And my shop has lights. It originally had 2 400w sodium lights. Vile looking orange light totally unconducive to trying to determine true color. It took me 2 years before I figured out what I wanted/needed. Lots of investigation. I settled on 54wHO T5 5900K 4' x 6 bulb hi bay fixtures with a CRI of 93+.
Now that's some real light.
In your situation I can understand it.

A good choice for you, so you can see how much saw dust is on the floor.
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Old 02-16-2011, 10:48 PM   #17
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Re: Differences In Light Bulbs?


I still have to supplement it with some 4' T8 32w x 2 fixtures. 5000K CRI 85
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Old 02-16-2011, 11:39 PM   #18
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Re: Differences In Light Bulbs?


here is some bedtime reading about full spectrum lamps
http://www.fullspectrumsolutions.com/cri_explained.htm

There are some tradeoffs between the reds and blues when you get into the higher k temps and higher cri's so if you are trying to accent red wine you might actually set up a bench light and try different combinations or you may have a bulb store nearby that has a setup with the different lamps. ... I had a chart on the the crossover I'll see if I can find it.
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Old 02-16-2011, 11:49 PM   #19
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Re: Differences In Light Bulbs?


Quote:
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Ok so I put the Day light bulbs in as customer liked the light better.
He asked if I could make it any brighter. Right now there are 207 lumens a SQF. That is a crap load of light, you get a damn tan when they are are on. 12'x15' room with 16 4' t8 32w bulbs. Should I just get some 64w bulbs and see what he says or add more fixtures?

Cole
I think going with full spectrum will make it seem "brighter". That's about the same level of light that we're going for in the new shop: 80 T8 32W lamps in 1000 ft^2. We went with 5000K 98 CRI lamps and I've only regretted one part of that decision...writing the check.

Our electrician was concerned that so many full-spectrum lamps in an isolated, rural shop might raise a few questions.
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Old 02-16-2011, 11:59 PM   #20
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Re: Differences In Light Bulbs?


Quote:
. The regular bulb turn the wine brown.
I wonder if he means appearance or it actually turns it brown? In a meat case at the grocery store they use a special bulb that supposedly slows down the decay rate of meat and the "turning brown " effect. It could probably be argued whether it actually slows down decay but it for sure makes meat look better, brighter. Those lamps are somewhere around 4100k and 60 cri with some special coatings.

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