3w full spectrum led

hi....i have grow room with 250w hps but i would like to change that light with leds
so i found this 3w chips and i was thinking to make 300w panel with them
does anybody now is this good or not...thanks

http://www.ebay.com/itm/252190123606?_trksid=p2057872.m2749.l2649&var=551025792095&ssPageName=STRK:MEBIDX:IT

What is the surface area you have to cover? And how tall is your grow space?

i can adjut to panel....it is 1,5m tall
what do you think is covering surface with this kind of panel is

jaksa8 said:

i can adjut to panel....it is 1,5m tall
what do you think is covering surface with this kind of panel is

Click to expand...

It depends on the lens angle of the led as well as how high you mount the light.

lighting angle:120~140 degree
so is it worth to build with that led chips

Please help

I wouldn't use them. That is a lot of work for a few watts. I would start with one or 2 COBs. Even one Vero 29 on a 60 dimmable driver is a great start. You just wouldn't get much with $8 in chips and driver.

Yes but 100pcs is that too little?

jaksa8 said:

Yes but 100pcs is that too little?

Click to expand...

It's difficult to tell. 3 watts is the chips rated current, but the driver is .65 amps and whatever voltage the chips require. It could be more like 2 watts each. The driver indicates at max voltage it would output 22 watts. Plus, the ad doesn't state what model number the emitters are, so you don't know how much light they will provide at any specific power even if you did know the wattage.

The main point to consider is that it's likely not an upgrade as far as lumens per watt vs the HPS. Take a look at Vero 18 or 29, and CXB 3590 and 3070. Much easier to build with a couple cobs rather than 100s of stars and much more light for the same wattage. Or upgrade to a 400w HPS for a low cost solution.

thanks for help...
now how many of CXB3070 do i need to replace 250w hps

Why led? If you have at least 6 ft head room I would recommend you check out the 315 lec. Good luck!