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@vasqueso I DM'd you, as I don't want to saturate the forum with replies. Cool Stuff!
Posted : 19/03/2026 7:35 pm
@vasqueso I DM'd you, as I don't want to saturate the forum with replies. Cool Stuff!
If the conversation might be useful to others, go ahead and flood us with replies :D. I've been silently keeping up on this thread to see what others are doing with this project. Still have my own half finished sunlamp.
Posted : 19/03/2026 9:34 pm
marcdraco and Hexaclover reacted
Damn they pretty!!
Take everything I say with a pinch of salt, I might be wrong and it's a very *expensive* way to learn!
Posted : 15/04/2026 4:19 pm
What kind of colloidal silica did you use? When I searched for products, it seems like that there's quite a few different types, there's also powder types sold as resin filler for construction. It would help if you could tell me the specific brand and/or where you sourced it from too if you know it.
Posted : 01/06/2026 7:45 am
If one were to professionally manufacture a reflector into a say 30*60cm (1*2') or 60*90 cm (2*3') wall or ceiling panel, how thin do you think you could get it? And would you have to use a square panel instead or would rectangular do? And could you get the same effect with a square or rectangular reflector or does it really need to be circular? I don't think circular would be a nonstarter, but you would have to compress it to maybe no thicker than 3" for a wall panel or 12" for a sunken ceiling panel. I reckon though you could get it under 3" with a fairly small coverage area.
Posted : 27/07/2026 2:34 pm
@curiouskiwicat a bit of napkin calculus tells me (if I've understood your question correctly): if you want a parabolic reflector in your ceiling to project light straight down, with a light source no lower than the rim of the parabola, then the depth has to be at least 0.2x the width. That is, if you want a parabola 30cm across, it has to be at least 6cm deep.
Posted : 09/08/2026 10:47 am
@curiouskiwicat a bit of napkin calculus tells me (if I've understood your question correctly): if you want a parabolic reflector in your ceiling to project light straight down, with a light source no lower than the rim of the parabola, then the depth has to be at least 0.2x the width. That is, if you want a parabola 30cm across, it has to be at least 6cm deep.
Posted : 09/08/2026 10:47 am
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