[alt-photo] Re: Alternative Exposure Unit (no pun intended)

[Mark Nelson]

Oooops I meant has anyone tried UV LED lights?

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Mar 11, 2010, at 6:12 PM, pfriedrichsen at sympatico.ca wrote:

> I would like to mention one other caution on the fotodiox unit.
>
> CFLs don't like to be operated in an inverted positon. (especially  
> the larger lamps like these). The heat rises off of the lamp and  
> overheats the electronic ballast which has some heat sensitive  
> components. Worse, is the large number of surrounding lamps all  
> heating each other up (480 watts for the whole lot). The inner lamps  
> may have a very short life.
>
> I think you would need to add some forced air cooling if you wanted  
> a reliable exposure unit.
>
> Peter Friedrichsern
>
>
>
>
>
> At 04:58 PM 03/11/2010, you wrote:
>> Christine, Group:
>>
>> I had been using a custom made BLB set up with 8-24" bulbs for over  
>> 15
>> years. The bulbs are very expensive to replace and my exposures  
>> were 90
>> seconds to 7 minutes. Last month Barry Schmetter brought in a  
>> Fotodiox unit
>> for me to use for a gumprint demo at the Large Format and Alternative
>> Photography Gathering (Metro Wash DC). Using my gum/pigment mix 1:1  
>> with 15%
>> ammonium dichromate sensitizer I was able to reduce my first  
>> emulsion from 7
>> minutes to 70 seconds. It was perfect. The second emulsion was  
>> correct in 30
>> seconds. This unit has completely changed the way I print.
>>
>> http://www.fotodiox.com/catalog/product_info.php?products_id=78  
>> fitted it
>> with 16 Bright Effects (swirly type; 26 watts daylight or 6000K  
>> from Lowes).
>> The unit is intended to sit on a lighting tripod but I added a  
>> clamp and
>> attach it to a heavily loaded bookcase. The unit is currently going  
>> for $135
>> + shipping. Add $30 for a clamp if you can't rig up something, a  
>> builder
>> pack of the bulbs, and you have a very fast, compact, and portable  
>> exposure
>> device.
>>
>> Best,
>> Carole
>>
>>
>>
>> On Thu, Mar 11, 2010 at 4:18 PM, Christina Anderson <zphoto at montana.net 
>> >wrote:
>>
>> > Has anyone bought one of these and used for alt or gum?
>> > And what is the best URL for a plan to build one's own?   
>> Apparently the
>> > plan I hand out to students out of Nadeau's is incomplete, but  
>> since I am a
>> > building failure, I can't explain why it is incomplete.  I  
>> wouldn't know a
>> > magnetic ballast from a martini frankly.
>> > Chris
>> >
>> >
>> > http://www.silkscreeningsupplies.com/site/799934/product/RXP2024
>> >
>> > Christina Z. Anderson
>> > christinaZanderson.com
>> >
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