> Someone here linked to it … Not clear to me where to buy them though… (anyone know?)
Click on the price link in my post above. The website is in French, but it ships from Netherlands. I don’t know why… there’s always google translate… Also you can search for the ref “Osram 4058075134485” and you’ll find shops.
Note I don’t like 2700K at all so I don’t like this bulb. But if you do like 2700K and you want 95CRI, it’s quite cheap.
> I really like the concept, but i’m always curious about how hot the filaments get, since they have zero heat path.
The bulb is filled with gas at higher than atmospheric pressure that transfers heat by convection. Not vacuum like an incandescent bulb… However, convection carries heat upwards, so if it is mounted in a luminaire with the glass bulb upwards, the top of the bulb will be hot and electronics in the cap will be cool. If it is mounted with the glass bulb pointing down, electronics in the cap will cook. These lightbulbs are not really built to last…
> I don’t understand why LED filament bulbs are usually clear glass. Frosted is much better.
If the bulb is visible then frosted is much better. If the luminaire has a frosted glass diffuser then the bulb does not need to be frosted. For wall mounted luminaires (example ), the bulb throws half its light output at the wall. The back of the luminaire is usually white or reflective so it reflects light back through the clear bulb and into the diffuser in the front. Taking this into account, a clear bulb will be much brighter than a frosted one.
In fact for a wall-mounted luminaire, a bulb that throws all the light to the front with a heatsink at the back would be nice… but that wouldn’t sell because once you screw it in, most likely it will end up in the wrong orientation.
I don’t think frosting or even white powder on the inside costs a lot of Lumen.
Maybe you know / remember the Philips Argenta Tungsten bulbs of the past?
Do not buy on aliexpress led bulb kits! Buy on taobao!
There is one big problem with led bulb kits from aliexpress seller what I find. Plastic thing (where E27 carving). This plastic will die and crumble (turn into dust, will cracked) after about 6 month =( That was the reason why I bought 3d printer. I will do this part from poliuretan plastic. From taobao sellers it is still alive =) But I do not want to repeating this situation. It must work 20-35 years in my lamps!
Does anyone plan on reviewing high CRI LED tubes? The kind you replace fluorescent bulbs with. I have two 48” fixtures in my living room and would like to get some high CRI tubes to put in them. Or maybe i should just change the fixtures?
The fins on these heatsinks are too tight. Convection cooling works better with wider spacing between fins… but this is taobao, so they probably go by “more fins better”
I’ve made a pendant light.
This is a lampshade from the store, 4 ExpertColor 3000K spots, some accessories, and a round piece of acrylic diffuser with a patterned “bumpy” side. I frosted the other side. It works very well and makes a beautiful soft diffused light. Sure it is a bit weird to use GU10 spots to make what is basically a big softbox, but… that’s what I had on hand and I really like the tone from these. They’re perfect to light the dining table. I think I’m going to make another with Sunlike LEDs.
no =)
this is the winner in low CCT (2700-2800k) :face_with_monocle:
0.5$ per 1pcs :money_mouth_face:
CRI:99-100 CQS:99-100
But I made glass mated by myself
If add diode (or low voltage) - it will be more low CCT
