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#1
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Has anyone used GE Reveal light bulbs for indoor photography?
Hi all,
I've been wondering about these GE "Reveal" light bulbs. Can they be used indoors for photography or are they not correctly color balanced? Until now, I've been using an 81A (blue) filter when taking indoor pictures and daylight balabced film. Anyone know what color temp the lightbulbs are? What happens if you use flash with these bulbs? Thanks in advance for any replies. Viken Karaguesian http://home.comcast.net/~vikenk |
#2
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On Mon, 29 Nov 2004 19:27:00 -0500, "Viken Karaguesian"
wrote: Hi all, I've been wondering about these GE "Reveal" light bulbs. Can they be used indoors for photography or are they not correctly color balanced? Until now, I've been using an 81A (blue) filter when taking indoor pictures and daylight balabced film. I tried Reveals in a copystand. They are still considerably redder than daylight. I recently ordered some full spectrum fluorescent bulbs from Sunwave. I'll give those a try next. -- Michael Benveniste -- Spam and UCE professionally evaluated for $419. Use this email address only to submit mail for evaluation. |
#3
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Viken Karaguesian wrote:
Hi all, I've been wondering about these GE "Reveal" light bulbs. Can they be used indoors for photography or are they not correctly color balanced? Until now, I've been using an 81A (blue) filter when taking indoor pictures and daylight balabced film. Anyone know what color temp the lightbulbs are? On the ge websites, the bulb has a bluish tint, so some 'warmth' will be filtered out. They mention neodymium as an element in the glass that provides filtering. There is no meniton of the specific color temp. I've posted a question to them asking the color temp. What happens if you use flash with these bulbs? Depends on the ratio of light between the two. A flash shot is a double exposure where aperture/shutter applies to the ambeint light and aperture/flash power applies to the flash light. Use an incident/flash meter to measure both, if the flash light is 2 stops more than the ambient, then the coloration from the ambient will probably not be perceptible (and the contribution won't be much either). Cheers, Alan -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. |
#4
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Viken Karaguesian wrote:
Hi all, I've been wondering about these GE "Reveal" light bulbs. Can they be used indoors for photography or are they not correctly color balanced? Until now, I've been using an 81A (blue) filter when taking indoor pictures and daylight balabced film. Anyone know what color temp the lightbulbs are? On the ge websites, the bulb has a bluish tint, so some 'warmth' will be filtered out. They mention neodymium as an element in the glass that provides filtering. There is no meniton of the specific color temp. I've posted a question to them asking the color temp. What happens if you use flash with these bulbs? Depends on the ratio of light between the two. A flash shot is a double exposure where aperture/shutter applies to the ambeint light and aperture/flash power applies to the flash light. Use an incident/flash meter to measure both, if the flash light is 2 stops more than the ambient, then the coloration from the ambient will probably not be perceptible (and the contribution won't be much either). Cheers, Alan -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. |
#5
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Viken Karaguesian wrote:
Hi all, I've been wondering about these GE "Reveal" light bulbs. Can they be used indoors for photography or are they not correctly color balanced? Until now, I've been using an 81A (blue) filter when taking indoor pictures and daylight balabced film. Anyone know what color temp the lightbulbs are? What happens if you use flash with these bulbs? Thanks in advance for any replies. From GE (by e-mail): "Similar to other common household bulbs, Reveal products use incandescent lamp technology. The quality of the Reveal light is achieved by adding the element Neodymium to the glass. It is what gives GE Reveal bulbs their distinctive powder-blue color when not lit. When lit, the element provides a pure, true light by filtering out much of the dulling yellow cast common from ordinary light bulbs. Reveal lamps have a color temperature of approximately 2850 degrees Kelvin and a CRI of 75." 2850K sounds pretty close to a regular incandescent bulb, so you might not see much difference at all (or the GE lady replying doesn't know what she's talking about). The CRI indicates a decent ability to light things in a manner that 'reflects' (PNI) their true color under natural light. http://www.google.ca/search?num=20&h...endering+index has many general defs of CRI that are not terribly coherent. As they say, "go buy a couple and test it" (use a neutral slide film like Sensia 100 or EliteChrome 100). Cheers, Alan -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. |
#6
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"... Reveal lamps have a color temperature
of approximately 2850 degrees Kelvin and a CRI of 75." Does **not** sound good for use with Daylight balanced color film, or Daylight white balance. (1) The color temperature is very **low** ... standard photofloods are 3200 / 3400 degrees Kelvin ... and they require substantial filtering to match the daylight standard of 5500 degrees Kelvin. (2) A "CRI" of 75 is very low for any photographic application. You should be looking at something with a "CRI" in the 90%-plus range. "Alan Browne" wrote in message ... Viken Karaguesian wrote: Hi all, I've been wondering about these GE "Reveal" light bulbs. Can they be used indoors for photography or are they not correctly color balanced? Until now, I've been using an 81A (blue) filter when taking indoor pictures and daylight balabced film. Anyone know what color temp the lightbulbs are? What happens if you use flash with these bulbs? Thanks in advance for any replies. From GE (by e-mail): "Similar to other common household bulbs, Reveal products use incandescent lamp technology. The quality of the Reveal light is achieved by adding the element Neodymium to the glass. It is what gives GE Reveal bulbs their distinctive powder-blue color when not lit. When lit, the element provides a pure, true light by filtering out much of the dulling yellow cast common from ordinary light bulbs. Reveal lamps have a color temperature of approximately 2850 degrees Kelvin and a CRI of 75." 2850K sounds pretty close to a regular incandescent bulb, so you might not see much difference at all (or the GE lady replying doesn't know what she's talking about). The CRI indicates a decent ability to light things in a manner that 'reflects' (PNI) their true color under natural light. http://www.google.ca/search?num=20&h...q=define :col or+rendering+index has many general defs of CRI that are not terribly coherent. As they say, "go buy a couple and test it" (use a neutral slide film like Sensia 100 or EliteChrome 100). Cheers, Alan -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. |
#7
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RSD99 wrote:
"... Reveal lamps have a color temperature of approximately 2850 degrees Kelvin and a CRI of 75." Does **not** sound good for use with Daylight balanced color film, or Daylight white balance. (1) The color temperature is very **low** ... standard photofloods are 3200 / 3400 degrees Kelvin ... and they require substantial filtering to match the daylight standard of 5500 degrees Kelvin. (2) A "CRI" of 75 is very low for any photographic application. You should be looking at something with a "CRI" in the 90%-plus range. 1) Don't top post. 2) Read the thread ... I was answering somebody else. A: It's hard to read Q: Why? A: No Q: Should I top post? "Alan Browne" wrote in message ... Viken Karaguesian wrote: Hi all, I've been wondering about these GE "Reveal" light bulbs. Can they be used indoors for photography or are they not correctly color balanced? Until now, I've been using an 81A (blue) filter when taking indoor pictures and daylight balabced film. Anyone know what color temp the lightbulbs are? What happens if you use flash with these bulbs? Thanks in advance for any replies. From GE (by e-mail): "Similar to other common household bulbs, Reveal products use incandescent lamp technology. The quality of the Reveal light is achieved by adding the element Neodymium to the glass. It is what gives GE Reveal bulbs their distinctive powder-blue color when not lit. When lit, the element provides a pure, true light by filtering out much of the dulling yellow cast common from ordinary light bulbs. Reveal lamps have a color temperature of approximately 2850 degrees Kelvin and a CRI of 75." 2850K sounds pretty close to a regular incandescent bulb, so you might not see much difference at all (or the GE lady replying doesn't know what she's talking about). The CRI indicates a decent ability to light things in a manner that 'reflects' (PNI) their true color under natural light. http://www.google.ca/search?num=20&h...q=define :col or+rendering+index has many general defs of CRI that are not terribly coherent. As they say, "go buy a couple and test it" (use a neutral slide film like Sensia 100 or EliteChrome 100). Cheers, Alan -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. |
#8
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RSD99 wrote:
"... Reveal lamps have a color temperature of approximately 2850 degrees Kelvin and a CRI of 75." Does **not** sound good for use with Daylight balanced color film, or Daylight white balance. (1) The color temperature is very **low** ... standard photofloods are 3200 / 3400 degrees Kelvin ... and they require substantial filtering to match the daylight standard of 5500 degrees Kelvin. (2) A "CRI" of 75 is very low for any photographic application. You should be looking at something with a "CRI" in the 90%-plus range. 1) Don't top post. 2) Read the thread ... I was answering somebody else. A: It's hard to read Q: Why? A: No Q: Should I top post? "Alan Browne" wrote in message ... Viken Karaguesian wrote: Hi all, I've been wondering about these GE "Reveal" light bulbs. Can they be used indoors for photography or are they not correctly color balanced? Until now, I've been using an 81A (blue) filter when taking indoor pictures and daylight balabced film. Anyone know what color temp the lightbulbs are? What happens if you use flash with these bulbs? Thanks in advance for any replies. From GE (by e-mail): "Similar to other common household bulbs, Reveal products use incandescent lamp technology. The quality of the Reveal light is achieved by adding the element Neodymium to the glass. It is what gives GE Reveal bulbs their distinctive powder-blue color when not lit. When lit, the element provides a pure, true light by filtering out much of the dulling yellow cast common from ordinary light bulbs. Reveal lamps have a color temperature of approximately 2850 degrees Kelvin and a CRI of 75." 2850K sounds pretty close to a regular incandescent bulb, so you might not see much difference at all (or the GE lady replying doesn't know what she's talking about). The CRI indicates a decent ability to light things in a manner that 'reflects' (PNI) their true color under natural light. http://www.google.ca/search?num=20&h...q=define :col or+rendering+index has many general defs of CRI that are not terribly coherent. As they say, "go buy a couple and test it" (use a neutral slide film like Sensia 100 or EliteChrome 100). Cheers, Alan -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. |
#9
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"Alan Browne" posted:
"... 1) Don't top post. 2) Read the thread ... I was answering somebody else. ...." Regarding your item (1): Screw You. Regarding your item (2): I did "read the thread" ... and you left it incomplete. You provided information without any form of analysis ... I provided the missing information and the analysis of the light bulb's (non)suitability for the task at hand. Oh ... and if you insist on that stupid archaic "bottom posting" ... learn how to **trim** your posts. |
#10
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"Alan Browne" posted:
"... 1) Don't top post. 2) Read the thread ... I was answering somebody else. ...." Regarding your item (1): Screw You. Regarding your item (2): I did "read the thread" ... and you left it incomplete. You provided information without any form of analysis ... I provided the missing information and the analysis of the light bulb's (non)suitability for the task at hand. Oh ... and if you insist on that stupid archaic "bottom posting" ... learn how to **trim** your posts. |
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