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Old 06-10-2004, 09:32 AM   #21
Kent Curole Kent Curole is offline
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Thank You Marvin and Garth

This is exactly the information I was looking for. Priceless info! Great photos to show your usage. Now my only concern will be mounting and placement so it's off to the drawing board.

Thanks Again,

Kent
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Old 06-10-2004, 09:59 AM   #22
Marvin Mattelson Marvin Mattelson is offline
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Garth, I've never heard of this brand of light. I checked out the website but didn't see the CRI published anywhere. You'd think that such a high CRI would be a major selling point.

I've tried other brands of 5000 K bulbs in the past and found them to be too yellow compared to the north light that enters my studio. That was always a big problem for me, the discrepancy. The Lumichrome bulbs I use are a much better match for my purposes, weighing in at 6500 K as well as having a 98 CRI.

I like the Light Array on the boom arm because I can swing it around and change position. I can vary the distance and angle because of the boom arm. This is helpful because I can move it to avoid glare on my painting.

The main selling point for me, however, was the fact it has an electric ballast which means that the lights don't flicker, a big plus while doing hours upon hour of scrutinizing my canvas. A "normal" fluorescent shop fixture has a magnetic ballast which can lead to eye fatigue, I've been told.

My T8 Lumichrome bulbs are specifically designed for an electric ballast.
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Old 06-10-2004, 10:06 AM   #23
Kent Curole Kent Curole is offline
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Lumichrome watts

Marvin,

Which model # of the Lumichromes do you use? I see they come in various wattage for each length.

Kent
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Old 06-10-2004, 10:23 AM   #24
Holly Snyder Holly Snyder is offline
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Last week I set up a light fixture basically identical to Garth's. I bought 2 electronic ballasted strip lights (one from Home Depot for $29 and one from Lowe's at $25). The reason for two different ones is that I had bought one, found that there was a still a slight hum, so I tried a different manufacturer. As it turns out, they both have the same Sylvania ballast. I tried unscrewing the ballast and putting a little piece of rubber gasket between the ballast and metal housing, but it didn't seem to make a difference. In any case, the hum is very low, and I certainly can't hear it when playing music.

Anyway, I mounted them on a white melamined 1' x 4' board. Rather than wiring up in the ceiling, I hid the 2 cords in the plastic sheath you can see in the photo extended down from the lights. They plug in to an outlet strip mounted low on the wall beneath the ceiling to floor windows. I also clamped the power cords in a metal "clamp combination connector" mounted in a hole drilled out in the bottom of metal light housing, so when the cords are pulled they don't rub against the sharp metal housing and cut the cord.

At the top of the fixture is a white curtain rod. I bought a clear 2' x 4' acrylic sheet, the kind that goes under any home fluorescent lights. I plan on velcroing the top of the sheet, as well as the curtain rod, so I can hang the sheet in front of the lights. Although I haven't tried it yet, I can use this to diffuse the light if I have a model and it happens that the light is glaring in their eyes. As with Marvin, I also have a setup for installing curtains to completely block the light on the model and light the model separately.

I bought four T8, 32 watt, 4 foot lumichrome lamps, two are 5000K (96 CRI) and two are 6500K (98 CRI). Kent, the Home Depot and Lowe's electronic ballasted fixtures can handle a max of 32 watts. Garth I wish I'd heard about the Just Normlicht lights earlier. However the lumichromes were a little cheaper, they were $66.80 from http://www.truesun.com including shipping.

I'm pretty happy with the set up so far.

Holly
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Old 06-10-2004, 10:32 AM   #25
Marvin Mattelson Marvin Mattelson is offline
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Kent- Lumichrome
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Old 06-10-2004, 10:44 AM   #26
Holly Snyder Holly Snyder is offline
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Marvin,

I couldn't decide on which ones to get, so I got both. The 6500K are bluer and the 5000K are redder. I'm not sure which I like better, but I'm leaning towards the 5000K Originally I thought I'd only need two lights (one fixture), but then with the four lights I decided to use two fixtures. So far I've been painting with both fixtures on, basically mixing the light color. The extra light is wonderful.

I should get around to posting the spectrums of each using the diffraction grating method pretty soon.

Holly
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Old 06-26-2004, 10:33 AM   #27
Joan Breckwoldt Joan Breckwoldt is offline
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question Hum in light fixtures

After another solid week of rain here in Houston I must do something about providing light in my 'studio'.

Holly and Garth, it looks like you're both using the same T-8 light fixtures from Home Depot (and one from Loew's for you Holly) but Garth, you mentioned your doesn't hum, but Holly, your light fixtures do.

The light tubes themselves wouldn't cause the humming, would they? As I understand it, it's the ballast in the fixture that may cause humming.

I don't listen to music when I paint, or anything else, so I would prefer to find a quiet set up.

Does anybody have an explanation as to why some light fixtures hum and some don't?

Thanks!

Joan
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Old 06-26-2004, 11:09 AM   #28
Sharon Knettell Sharon Knettell is offline
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The transformative HUMMMM!

Quote:
Originally Posted by Joan Breckwoldt
After another solid week of rain here in Houston I must do something about providing light in my 'studio'.

Holly and Garth, it looks like you're both using the same T-8 light fixtures from Home Depot (and one from Loew's for you Holly) but Garth, you mentioned your doesn't hum, but Holly, your light fixtures do.

The light tubes themselves wouldn't cause the humming, would they? As I understand it, it's the ballast in the fixture that may cause humming.

I don't listen to music when I paint, or anything else, so I would prefer to find a quiet set up.

Does anybody have an explanation as to why some light fixtures hum and some don't?

Thanks!

Joan
Joan,

My husband, an electrical engineer, has come up with an explanation and perhaps a remedy for your dilemma.

You were right about the ballast, aka, as the transformer being the problem. The bulbs do not hum as you so correctly observed. The transformer in the fixture is failing and depending in the kind of fixture you have, it may or may not have to be replaced. Sometimes a fixture will be equipped with a starter, a 3/4" silver cylinder at either end. If you can find that, remove it and take it with you to a hardware store to get the proper replacement as they often differ. If you cannot find a silver cylinder then you need a new fixture as the transformer is inside.

I hope that will help!

That puts to rest the myth that a partner should have equal interests! His scientific knowhow has bailed me out of many a pickle.
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Old 06-26-2004, 11:10 AM   #29
Garth Herrick Garth Herrick is offline
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Hi Joan,

I had to turn off my computer to listen for any signs of humming from my T-8 lights. To be honest, if I listen really carefully, there is a very very very very very slight hum, but I really can not hear it. It is quieter than the soft breeze blowing out my window, and many times quieter than my computer. I am sorry to hear Holly's lights do hum, but mine effectively don't.

Garth
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Old 06-26-2004, 12:45 PM   #30
Joan Breckwoldt Joan Breckwoldt is offline
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Fixtures

Quote:
Originally Posted by Sharon Knettell
Sometimes a fixture will be equipped with a starter, a 3/4" silver cylinder at either end. If you can find that, remove it and take it with you to a hardware store to get the proper replacement as they often differ.
Thank you Sharon for your response. I haven't bought the light fixtures yet and I was just wondering (before I headed off to Home Depot) why some seem to hum and others don't. It sounds like a brand new fixture shouldn't hum and one that hums is defective in some way? Or, as you said, needs a replacement part becuase of age?

Thank you Garth, a slight hum is fine. Our computer is in my 'studio', which is really the studio/computer room, and I never even noticed the hum of the computer. I am not lucky enough to have a soft breeze outside the window, it's pounding rain and thunder lately.

I am sure my husband will not be excited about this next project, putting up lights! But, I will just have to remind him that this will (hopefully) further my career (i.e. get money for paintings!).

Thank you Sharon and Garth,

Joan
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