I got my new lamp. It is for commercial projection use. people use it to replace the

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#261
Hi all,

Thats a great pic !!!!!

As for my ballast, I'm looking into building my own for 400w but I will need more info on driving these lamps from YWH ???

Would 18 wheeler have a PDF list/prices of all the globes etc that YWH can sell ?????


Cheers !!!!
 
#262
I've been looking at manufacturers in China for ballasts and have come across a few that say that they have (or can build, don't know, because they didnt say if it was available of if they have to build one) a 250w ballast, that i think will be perfect for the lamp.

I've emailed a few saying i need a ballast that can output 60V at 4amps (this info from what 18wheeler posted a while ago, for the operating volatage and current for the lamp).

I've asked them to send the exact specs of the ballast they say can do exactly what i need, just to confirm, then i just need their min order quantity and prices.

Ill keep you updated....
 
#263
vlass said:
YWH, Wheeler,

1 - Which globes have longer life AC or DC or are they much of a muchness, Any advantages with one opposed toi the other ?

I would prefer to go with DC as I am an electronics person and building a DC electronic ballast may be easier. Essentially a modified SMPS with high voltage tap for ingition voltage / pulse start and current limit.
Click to expand...

Here is the answer from ywh:
From the spec provided by the manufacture, there is no difference between AC and DC lamps. But I noticed that most commercial projector use AC lamps, so I guess AC lamps have their advantages; on the other hand, from the design of DC ballasts I have seen, they can be made very simple, so the cost would be reduced.
Click to expand...

ywh also send me a paragraph on the difference between AC and DC ballasts. My translation may not be accurate:
UHP lamps can be AC or DC types. AC lamps can reduce flickery by careful design of ignitor. on the contrast, DC lamps have less flickering by nature, plus positive and negative electrods have different function which further reduces flickering (??). In addition operation temperture range is wider in DC lamps, so the light output can be adjusted in 20% range. This (light output adjusting) can be an advantage for a projector. less power consumption means less current and heat at electrods, thus vaporation of electrods' is reduced and the life span can be increase by 1.5 ~ 2X. Also, less power consumption decreases heat emitted by the lamps, which helps to cool the projector. Especially cooling fan can be operated in lower power mode, reducing noise too. Another point: a DC ballast doesn't need switches, which reduces the size of the ballast rather small. AC lamps frequency needs to match DMD (Digital Mirror Devices ( is it DLP ) ), while DC lamps do have this trouble. But, DC lamps have large positive electrod volume, which easily cause uneven light output and heat distribution pattern. But with technoledge advancing, those problems could be solved by better cooling method and careful optic simulation.
Click to expand...

Hope my translation makes sense.
 
#264
vlass said:
Hi all,

Thats a great pic !!!!!

As for my ballast, I'm looking into building my own for 400w but I will need more info on driving these lamps from YWH ???

Would 18 wheeler have a PDF list/prices of all the globes etc that YWH can sell ?????


Cheers !!!!
Click to expand...

please refer to the spec table in this form. once you have it made, you probably can send your design to the manufacturer so we can have it too 😀

price for all lamps are $40 a piece, and $5 shipping to all the world for up to 2 lamps.
 
#265
i just saw the PDF with the projector lamps and i noticed that the nec mt 1000 is not included although the nec mt 810 which apparently takes the same lamp as the mt 1000 is. pls someone tell me this is by mistake because i have just ordered an old mt 1000.

THANKS.
 
#266
Update on the ballasts from the manufacturers....

We can provide ballast of this type:Input voltage:220V,Power
watter:250W,output voltage:60V,electric current:4amps.The least order is 300 pieces,FOB ningbo:USD 39.31,Delivery time: one week.
Click to expand...

Maybe YWH can visit them if they are close and see how it goes with the 250w lamp.

I think we might be able to get the min order down a bit. If this work, then USD 40 is a good deal IMO for a ballast 🙂 especially to get the most out of these lamps..

If anyone needs more info let me know, and i will see what i can get out of this company..

Also, waiting on replies from others..
 
#267
18wheeler, I noticed in your lamp table that you only have a 400w DC lamp, but YWH mentioned above that post that he could get an AC or DC 400w bulb. Is the table incomplete?
Does anyone know the maximum voltage difference that the bulb and ballast can have? As I have a 400W AC ballast the outputs 80V where the 400w bulb in the table specifies 50V, any thoughts?

As for Ywh's E-ballast, I have found that you are actually better off switching the ballast on and off via a 12 V DC supply (instead of shorting mentioned point with solder) with a current limiting resistor (about 1K) attached to the opto-coupler on the board, this will put alot less strain on the ballast as the caps and other components on the board will have had a chance to charge, increasing the life of the ballast.
As for the squealing, this is due to a resonating transformer. To help reduce the severity of the squeal, you can try spraying some cct board laquer in and around the transformer. Ensure that the laquer is dry before re-applying power.
I'll try and get a photo soon.
 
#270
Hi all !

I am new to the DIY projector scene and am interested in building my very own projector. However I am unsure on a few things and hope that you could help me out.

From visiting diyprojectorcompany.com, I really like the Pico design and would like to make a projector with this casing. I am planning to buy the MDF locally and build it myself.

From reading around the web, I think that I need the following parts:

1. Lamp
2. Lamp holder
3. Lamp Reflector
4. Ballast - I am unsure exactly what a ballast does. Is it just used to power the lamp ? Do you plug one end to the lamp holder and the other end in the power point or is it more complicated ?
5. Fresnel lens set
6. LCD screen
7. IR Filter Glass - Can this be found easily locally or would I need some special one ?
8. Mirror - Will any mirror do or do I need some special one ?
9. Lens
10. Some computer fans

I would prefer to buy the whole lot as a kit (light source / LCD / optics). My requirements are to have a XGA lcd (looking at the NEC 6.3" you guys are selling) and around 150w / 250w light source. Would it be better to buy the whole lot from you guys (18wheeler / ywh) or just get the light source & LCD and buy the optics from diyprojectorcompany.com ? Would there be any quality difference ?

If you could post the cost (including postage to melbourne, australia) it would be much apreciated along with any advice you may have for a first timer 🙂

Thanks in Advance !
 
#275
I didnt put a multimeter to it but I remember reading the output voltage of the ballast is around 100 volts. I don't think too much voltage would cause it to not ignite. It's probably the lower current. Most standard 400w MH bulbs require around 4 amps. These UHP 400w's require 8 amps. A 400w electromagnetic ballast would probably be able to run a 250w UHP bulb though. I believe someone did that a few pages back.
 
#276
YWH,

Email chentongjiATwanjiaDOTcom, and he said he can manufacture the ballast,

say you received the details from me, (give him my email, he will know who i am)

The reason you didnt find it on the website, is because they have to build it for us...

Tell me what you can find out...
 
#277
hi sabrex


P=IU, SO:400w=50V*8A, but The extent of space between two electrode is too short.can not be use 100V. if to do that , that need to extent the space between two electrode,then, that is:400w=100V*4A


hi slodki

ok!i ask him: Operating Voltage=60V Current=4A,OK?
but i will not give him your email,the price for a native is cheaper maybe 🙂
 
#278
Hi YWH,

I've asked him a few times, and he says that output of 60V and 4amp.

I've sent you an email anyway, so please check your inbox.

The thing is, he will have to build it to our specifications. As to the price, i dont know how much cheaper it can get. He wanted USD 40 per ballast if we ordered 300 units. Im sure we can get the down a lot if we increase the price per unit.

Like i said, he wont have this ballast in the store, you have to email him and he can them manufacture them... I dont think he will give cheaper price to native (it would be nice tho🙂), since they are a manufacturer, and export ballasts. If you give my email, he will know all the specifications we need for the ballast anyway.
 
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