Goldenstarlaser B-RGB1800 Bright serie

[Doctorbass]

I am investing for a new and better projector than my reke. I have about 1200+/-200$ to put for that.

I discussed with the mate of Winni and he is suggesting the B-RGB1800 scanner with the DT30.

This one is 1180$ with the DT30 and have the 635nm diode and is full analog.

300mW of 532, 500mW of 635 and 1W of 445 seem a perfect match to me.

combined with the DT40 it look like really interesting !

I wonder.. for about he same price do you think if i make it myself ( i am 100% capable of ), if i could for the same price get more powerfull laser ?

It look like this one is the exact same good deal as the popular REKE 500RGB for the performance vs price ratio ?

make it myself and maybe get more for the same price or buying it 100% assembled ?

Thaks for every oppinions!

Doc

[swamidog]

it would be worthwhile asking for the beam specs on that 635nm laser. if it's a single 500mW diode and not optically corrected, it's going to be a bit of a firehose compared to your green.

I am investing for a new and better projector than my reke. I have about 1200+/-200$ to put for that.

I discussed with the mate of Winni and he is suggesting the B-RGB1800 scanner with the DT30.

This one is 1180$ with the DT30 and have the 635nm diode and is full analog.

300mW of 532, 500mW of 635 and 1W of 445 seem a perfect match to me.

combined with the DT40 it look like really interesting !

I wonder.. for about he same price do you think if i make it myself ( i am 100% capable of ), if i could for the same price get more powerfull laser ?

It look like this one is the exact same good deal as the popular REKE 500RGB for the performance vs price ratio ?

make it myself and maybe get more for the same price or buying it 100% assembled ?

Thaks for every oppinions!

Doc

[Doctorbass]

it would be worthwhile asking for the beam specs on that 635nm laser. if it's a single 500mW diode and not optically corrected, it's going to be a bit of a firehose compared to your green.

It's a dual 635 red with a cube BS

http://www.goldenstarlaser.com/brgb1800-p-352.html

Red 5*8mm <2.5mrad
Green <3mm <2.0mrad
Blue 2*4mm <3*0.5mrad ( might require the add of anamorphic prism combo....

[swamidog]

a 5x8mm beam with 2.5mrad divergence is pretty big.

expect the red beam to be clipped by your galvo mirrors. also, expect to have issue with your farfield spots not overlapping properly. you might ask winnie for a photo of the farfield spot at 50 feet (or whatever distance you anticipate projecting at) to make sure you're ok with the overlap.

It's a dual 635 red with a cube BS

http://www.goldenstarlaser.com/brgb1800-p-352.html

Red 5*8mm <2.5mrad
Green <3mm <2.0mrad
Blue 2*4mm <3*0.5mrad ( might require the add of anamorphic prism combo....

[White-Light]

Have you tried asking how much it would be with a 300mw 637 instead? That should murder your 532 at 1:1 and have much better beam specs. You'll be massively overblued but you would have been anyway.

I'd be tempted as an alternative to ask Winni if they could build you a 1.1 Watt of:

500mw 445
300mw 637
300mw 532

As I think it would be more balanced, although probably still low on green.

Alternatively, if you want higher powers then I'd suggest in your existing projector spec, you change the 500mw of 635 for 637 and up the green to at least 500mw and preferably more.

For comparison I have a stated (not measured) 500mw 532 with 680mw 637 and 1W 445. I have to turn the 637 down substanically to get all the cues to balance to their correct colours as with the 637 / 532 powers, some colours show white instead of their correct tones and turning the red down re-balances suggesting more red than the green can handle. Only a small number of more subtle shades are affected, but be warned 637 is a powerful colour with its tight beam specs.

[Doctorbass]

I agree that having low divergence & smaller beam at lower power would be better than high power but with fat beam loosing power on the small mirror etc...

Ok so the 637 have better beam spec right?

Let say i want close to that 1.8W power and go with better beam specs so choosing the 637nm red.. what power ratio would you suggest for the power of each red637, blue445 and green 532 for a good white ?

I think i ever saw a excel file for calculation of that right?.. you enter the wavelenght and it calculate the best ratio according to eyes sensivity?..

Doc

[White-Light]

Difficult call for me, don't know if others can help here.

I can only go on what I've seen in my projector and without a larger green to experiment with I can't be entirely sure.

However, I do think 637 throws the 1:1:1 magic ratio that exists with 640 out of the window in so far as you probably need increased green to compensate for the extra red visibility.

If I had to make a guess in my own projector I'd be somewhere between 800mw - 1W 532.

However, that makes the assumption that all the lasers are close to their stated powers where as in reality I know the projector is closer to 3W than 2.1W. So it then becomes a question of which powers are over and by how much...

I'm sure you're now seeing the problem caused by not knowing the exact powers in there. All I can say is that with quoted powers of 500mw 532, 680mw 637 and 1W of 445, the red has to be turned down Substancially to achieve a perfect spectrum (not white balance but normal spectrum of colour). The wild card as I said above is in knowing which lasers are over quoted power and by how much.

Personally, I wouldn't flinch at putting a 1W green in mine but it would be based on guesswork...

[Doctorbass]

OK so i will go with the HRGB1200 from the H serie. This serie is using the famous expensive 637 diode

Output red >170mw/637nm
Output green>200mw/532nm
Output blue >800mw/445nm

now the match would be perfect and the beam would be better.

i will take the DT40 wide option so for about the same price i will loose 600mW total power but will gain better red and have wide angle beam

I think it's the best option

Doc

[Doctorbass]

OK so i asked for a 500mW green upgrade for future upgrade on the red and maybe the blue... i dont care if the green is too powerfull i will correct that with Quickshow when waiting for upgrade on teh red and blue...
I have a 445nm M140 1.4-2W diode in a laser pointer that might put in the projector instead.. next will be to add an additional 637 with a cube BS

WIll probably will end out to have G 500mW B 1.4W and R 550mW for a total of 2.5W but at the moment it will be 1.2W to keep the color balance

Doc

[White-Light]

You will be massively overblued but thats a given really with what 445 diodes put out.

You also need to make sure that your chosen projector has the room to add the upgraded modules.

Your other alternative is to wait a while and save some more and go straight in and what you want, its far cheaper in the long run that buying and replacing modules.

Personally I'd also wait for a few more opinions before pulling the trigger and just make sure everyone is in agreement as others may have differing opions on this. Certainly I'd say that if you thought that you needed 1.8W its a big drop down to what you're now proposing especially when 0.8w of less than 1.2w will be blue. You're dropping from an original 800mw of red/ green to just 370mw in your new proposal. Just depends what you want it for but that is a big drop at these lower powers.