Brightest part of HID Bulb
- Thread starter sunny747
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kiwipaulie
Well-Known Member
I'm no lighting expert, I believe its right along the length and not much out the end.
I cant look at my 1k in vert mode
kermit2692
Well-Known Member
Any normal hid bulb will produce more light near the middle of the bulb.. It's very easy to see by placing the back of your hand under the light, exactly where the most intense area is.. This is why when I went 1000w I got a double end bulb, the filament runs through the entire length of the bulb and you plug it in on both ends so you get a larger "bright spot"
Dr. Who
Well-Known Member
The brightest spot is where the reaction is taking place.
Think of a funnel shape, with the thin end being as wide as the filament and going around the bulb completely. This would be the core "hot spot" . As your "cone" angle increases. The intensity of the light decreases.
There are plenty of charts available on-line showing effective light intensity degradation by angular and distance increase.
Think of a funnel shape, with the thin end being as wide as the filament and going around the bulb completely. This would be the core "hot spot" . As your "cone" angle increases. The intensity of the light decreases.
There are plenty of charts available on-line showing effective light intensity degradation by angular and distance increase.
No disrespect intended - but have you people, entirely, lost your minds? The brightest part of an HID is the Arc Tube, the bulb and the filament have nothing to do with it! The Metal Halide gas or the High Pressure Sodium gas is located in the Arc Tube and it is there, in the Arc Tube, that the "reaction" takes place.
The light proceeds to expand outwardly in all directions but it's shortest path is straight out the side of the bulb (at 90 degrees). Plus; as the angle increases, towards each end of the bulb, the relative thickness of "glass" that the light must penetrate increases.
The filament, or electrode, only serves to direct the electricity to the Arc Tube, And the external bulb is only there to enclose neutral gas around the Arc Tube so it wont burn up.
The light proceeds to expand outwardly in all directions but it's shortest path is straight out the side of the bulb (at 90 degrees). Plus; as the angle increases, towards each end of the bulb, the relative thickness of "glass" that the light must penetrate increases.
The filament, or electrode, only serves to direct the electricity to the Arc Tube, And the external bulb is only there to enclose neutral gas around the Arc Tube so it wont burn up.
It just occurred to me; I wonder if the OP is asking about 1.) Where is the brightest hotspot on an HID bulb? or 2.) Which direction should an HID bulb be oriented?
I think he was really asking about the second choice. So yeah, more light comes out the side of the bulb than the end. So generally it is better to mount an HID bulb Horizontally above the canopy.
Sorry if I offended anybody!
I think he was really asking about the second choice. So yeah, more light comes out the side of the bulb than the end. So generally it is better to mount an HID bulb Horizontally above the canopy.
Sorry if I offended anybody!
churchhaze
Well-Known Member
The brightest part is the metal threads that screws into the socket.
kermit2692
Well-Known Member
Look out we have Christopher walkin in the house lol.. In my case I was correct the filament runs straight through my entire bulb which allows for a larger bright spot.
kiwipaulie
Well-Known Member
Makes sense!
Dr. Who
Well-Known Member
I only tried to make it simple for understanding......I Like yours better! Prof that science can be understood...BTW, the glass also reduces UV emissions.
Now look into your bulb and be blinded by science..