I have just recently completed building myself a couple of light boxes and I am very pleased with the results. If anyone is interested in me building one for them, PM me and I can discuss price etc, one thing is for sure, they are going to be at least a third of the price of imported ones, and IMHO work just as well. The two attached images will give you some sort of idea of my construction. My method of construction allowes the light box to fit over the front of the telescope/dew shield, much like a cover so one does not need to balance it on the scope.
I use a 12v lighter type connector for the power, and each LED is rated at between 6000mcd and 12000mcd depending on the size of the box required.
If interested please feel free to ask any questions.
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Just for information I reckon that I have made well over 300 of these now for all types of scopes/cameras. One thing I have noticed recently is when I respond to someone with a quote/information, that is the last thing I hear from the person. It is only the minority do this, but I think it is quite poor form to not acknowledge someone if they have gone to the trouble to respond to a query, be it a cost query or whatever regarding the light boxes. I used to chase them up, but do not bother any more as it fills the mail box up too quickly.
So people please if I send a response, please acknowledge one way or another so I at least know that you have received it.
Here's a funny one, Erik got his light box Friday and apparently his young child decided to stand on the carton. He nearly cacked himself as the carton was dented, but the light box inside, was in tact. I do put a lot of bubble wrap in the packing, in this case it saved the day I reckon.
I have just found another use for your light box! Preliminary testing done already, going to be my artificial star generator! I just taped a blank piece of paper of the front and carefully stabbed some holes in it using a pen. It sort of worked, holes were too big to be able to use focusing mask but FWHM reading suggest that the length of my house is JUST long enough (within 1m).
So this week I plan to calculate the filter offsets while Melbourne is having windy, cloudy and rainy evenings
They say necessity is the mother of invention, I never thought of this one, but I see no reason if the holes are tiny enough why it would not work. Might I suggest that you use matt black paper, relatively heavier density than normal paper. that way you could do it at night as well without all the extra light bleeding out. I cant remember if I added a dimmer to your light box, but that could also be of assistance as well.