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Here are a couple of pics of the two 445nm moving heads I built.
They´re performing great so far, and people love them for their small size and punch.
Enjoy! *retardo
Attachment 22179 Attachment 22180http://www.photonlexicon.com/forums/...isc/pencil.png
They look great, but I wonder if anyone's felt the urge to walk over to one and put their hand into the beam. Or a bottle of beer. Maybe it's just me, but this the most dangerous thing I think I've ever seen done with a 1W laser source, much more so for 24W. :confused:*vigil
Compared to an average hmi1200 spotlight they are not spitting out more photons.
So *at the lens* the power density is just as dangerous.
@ laser dj
Can you tell me whats the NOHD of your builds ?
I reaaly don´t know, but I treat these machines with respect, they are very powerfull and dangerous. These pictures were taken before the club was open. The place around the moving heads was isolated so there was no chance of contact with the beams.Quote:
Originally Posted by -bart-
Thx
I just get very nervous whenever I see laser light heading up, especially straight up, from anywhere below head level. Doesn't matter how well the area is controlled. I'd recommend mounting them on the roof of a vehicle or something of similar height. Otherwise, I hope you're covered with lots of insurance! But they look GREAT!!!
Looking at the beam diameter, I assume the power density is probablt lower tham many small DPSS lasers.
Please can you confirm beam diameter & divergence? Or just diameter if thats all you know.
99% of the time we used them on rooftops.. In fact if I recall correctly that was the only time we used them on the floor.Quote:
Originally Posted by Eidetic
Attachment 23094
Pic is a video frame-grab
Starting off with 24 Watts, a 3" diameter beam would be around 400 milliwatts per square cm. So you could probably put about 100 milliwatts into an eyeball with the thing. They are among the coolest looking beams I've seen in a photo. What a great "searchlight" effect. Here in the US wouldn't you need the FAA to approve shooting them straight up? At least if you're within so many miles of an airport? The FAA's approval is probably conditioned on the laser being non hazardous and only representing a startle hazard. Just thinking out loud and then writing down the noise. . .
- Mike
Not knowing the NOHD, means I'd personally have put plates on the scaffold in front of the moving heads so that if they failed and dipped down for any reason the audience would be shielded.Quote:
Originally Posted by laserdj
Why is it you keep posting pictures of them being NOT on rooftops ?Quote:
99% of the time we used them on rooftops
Where are the 198 rooftop pictures ? :rolleyes:
Attachment 23148Attachment 23149Attachment 23150Quote:
Originally Posted by -bart-
Here's 3 of them. These are the last pictures I post to this forum.
I really like the concern for safety measures presented by everyone. There's always more to learn to protect others and yourself. Please keep the dialogue open and flowing. Don't shut down.
You should add a angle swith in the tilt head, so if the head tilts more than 90 degree (below horizon) it turns the laser off. this way you will not have the danger of the head tilting down towards the crowd with the laser on.
Relax. People are bound to ask questions about safety and thats the way many people learn. No-one is saying you're unsafe, just questioning if things cannot be improved. Thats to your benefit and to the benefit of everyone who reads the forums looking for answers.Quote:
Originally Posted by laserdj
eg. Anyone with moving heads looking for safety advice now has McCarrots post above.