My Light Sphere Build (Pic Heavy)

[shrick]

On the other hand, I believe the spec of a dedomed XM-L2 U4 1C to be very close, if not on par, with that of a dedomed XP-L V6.

[M4D_M4X]

my 50cm styrofoam ball came today (a lot scratches on the outside )

maybe i start a own buildthread to collect your wisdom before i cut holes in that thing;)

[texaspyro]

@shrick

I’m thinking of maybe just fitting some kind of a filter (piece of film) over the light meter hole inside the sphere? What do you think, will this work? Its going to be more difficult for me to shift the meter further outwards. Don’t want to tamper with the mounting mechanism now.

Yes, it should work. You want your filter to be neutral density and not cause any color/tint filtering/shifts. Avoid white paper with UV brighteners in it. Maybe find some stoner kid/hippie and borrow a few cigarette papers. I measured some and they seem to make decent filters.

[shrick]

@texaspyro

@shrick

I’m thinking of maybe just fitting some kind of a filter (piece of film) over the light meter hole inside the sphere? What do you think, will this work? Its going to be more difficult for me to shift the meter further outwards. Don’t want to tamper with the mounting mechanism now.

Yes, it should work. You want your filter to be neutral density and not cause any color/tint filtering/shifts. Avoid white paper with UV brighteners in it. Maybe find some stoner kid/hippie and borrow a few cigarette papers. I measured some and they seem to make decent filters.

Thanks texaspyro We have a huge arts & crafts shop close by. They have many different types of paper, will go and have a look there.

How does one know you have material that does not effect the tint?

[djozz]

At least a filter should look white or grey when you shine white light through it. A significant tint shift can simply be seen as a colour. And subtle deviations from true white or grey will also not give a that worrisome tint shift (I think).

In my first sphere I used a piece of greyed black&white film as a filter. But I like the idea of a piece of cigarette paper :-)

(as for a coating of the inside of the sphere, that is a different story, light is reflected multiple times before reaching the sensor, any slight tint shift caused by the coating will be multiplied as well)

[light_junkie]

Slick may I ask where did you find the large hollow Styrofoam ball and how did you settle on the dimensions? I have been wanting to build one I just have no idea where to start,I think you did a great job!

[shrick]

Thanks Djozz. I’ll see if the arts shop has something more interesting… will report back, hopefully with some photos of a few options. PS: I’ll include the cigarette paper as an option.

[shrick]

@light junkie

Slick may I ask where did you find the large hollow Styrofoam ball and how did you settle on the dimensions? I have been wanting to build one I just have no idea where to start,I think you did a great job!

Thanks… I was lucky to find the ball at the same arts & crafts shop mentioned earlier in this thread. Earlier this year they actually had bigger balls than the one I’ve used. I had my eye on 1 of the biggest balls, did not take measurements then. When I eventually got to the point to go an buy the ball, the bigger ones were sold out - I was so disappointed. To make things worse, the shop did not plan to get in new stock soon. So, I just had to settle for the smaller size ball. Till date, I could not find any other suppliers of these hollow balls. I’m situated in South Africa.

[texaspyro]

@shrick

How does one know you have material that does not effect the tint?

My sphere controller has a color sensor mounted to it and I can calculate the CCT of the LED. I use the green channel of the color sensor for lumen readings. I calculate the CCT using several different algorithms… the simplest one uses the ratio of the red and blue channels. It agrees quite well with the rather complicated formula from the sensor maker (Taos) that uses all three channels.

The papers that I tested did not significantly shift the color temperature, only the intensity.

[texaspyro]

@djozz

But I like the idea of a piece of cigarette paper

Living an Amsterdam, I suspect you will not have much problem finding a variety of papers to test… :party:

[shrick]

@texaspyro

@djozz

But I like the idea of a piece of cigarette paper

Living an Amsterdam, I suspect you will not have much problem finding a variety of papers to test… :party:

Hehe… :bigsmile:

[djozz]

@shrick

@texaspyro

@djozz

But I like the idea of a piece of cigarette paper

Living an Amsterdam, I suspect you will not have much problem finding a variety of papers to test… :party:

Hehe… :bigsmile:

And you don't even have to go to shady shops to get them, even without 'wiet' in them, the dutch are the no1 rolling tobacco consumers in the world :-)