screen printing > DIY - From master engineered marvels to cobbled together jury-rigged or Jerry-built junk!
DIY LED Exposure Unit
blue moon:
--- Quote from: Fiodor Petrenko on January 18, 2019, 04:40:16 PM ---Hey, Doug, how are you? The work is from Pangea, not mine, so props to him. I will be starting mine next week.
The widht of the strip i'll be working with is about 1 cm, so I'll put one strip (1 cm. empty space) another strip, etc. until i cover 1 mt. lenght.
As I measured, the space between every led light is about 0.65 mm. and the distance between the glass and the lights will be about an inch. What do you think?
--- End quote ---
if the distance between LEDs is 0.65, the distance between the strips should be the same.
the distance to the glass will depend on the angles of the light the LEDs are producing.
You will also have problems with heat if you are only 1" away. Heat will kill your light source and it will also degrade the light output much faster.This in turn means you will have to adjust your exposure times often.
pierre
Fiodor Petrenko:
Hi, Pierre, I was considering what you said before on the thread. When you say " angles of the light the LEDs are producing"
you refer to the beam angle of light? the manufacturer specifies "120º beam angle", I don't know if this is useful information.
Is there an accurate formula to calculate the distance between the lights and the glass?
Thanks a lot for the advice, is very helpful for the beginners!
blue moon:
--- Quote from: Fiodor Petrenko on January 18, 2019, 09:23:04 PM ---Hi, Pierre, I was considering what you said before on the thread. When you say " angles of the light the LEDs are producing"
you refer to the beam angle of light? the manufacturer specifies "120º beam angle", I don't know if this is useful information.
Is there an accurate formula to calculate the distance between the lights and the glass?
Thanks a lot for the advice, is very helpful for the beginners!
--- End quote ---
yes, the beam angle. 120 seems to be the most popular. . .
yes, there is a way to calculate the spacing, unfortunately I don't have that formula. Easy way would be to get a UV meter and measure the field than keep tweaking until you get uniform readings.
pierre
mk162:
I know it would increase the exposure times, but wouldn't a diffuser help with the hot and cold spots?
It'll be a tough sell to get me away from my 7500k Amergraph. I do screens in about 15 seconds...2 up.
Sbrem:
--- Quote from: mk162 on January 19, 2019, 11:53:39 PM ---I know it would increase the exposure times, but wouldn't a diffuser help with the hot and cold spots?
It'll be a tough sell to get me away from my 7500k Amergraph. I do screens in about 15 seconds...2 up.
--- End quote ---
You might consider the power draw with the Amergraph. We just got the Saati ProLite 450, to replace a Violux 5000S (5K) and so far exposure times are similar to the Violux, but we still have considerable testing to do. Currently, we use Saati HU42 and Ulano Orange, and we're about to text Murakami T9... The ProLite is closer to a point source than a bed of LED's, but not as small as a MH bulb.
Steve
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version