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Project: Broiler Summary: A 33 watt grow light made from 19 blue and red LEDs. Each LED is glued onto a broiler pan which acts as a heat sync. This light should be excellent for growing many forms of plants and algae. It cost me about $113 in parts and shipping to make this unit. I estimate this light to be equivalent to a 300W HID/HPS grow light. Special thanks to Green Pine Lane for sharing the original concept of a "cookie sheet" LED grow light. Images: | ||||||||||||
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Parts:
| Device | Part# | Vendor | Qty | Price | Total | Shipping |
| Red LEDs | XR7090RD-L1-R2-M-C-0001 | LEDLightingSupply.com | 15 | 3.97 | 59.55 | 9.81 |
| Blue LEDs | XREBLU-L1-B4-J0-0-01 | LEDLightingSupply.com | 4 | 5.38 | 21.52 | |
| PCB Boards | 3/4in PCB Boards LBB 2 | LEDLightingSupply.com | 24 | 0.00 | 0.00 | |
| Resistors | P3.6W-2BK-ND | digikey.com | 4 | 0.20 | 0.80 | 6.57 |
| Terminal Strip | 274-679 | radioshack.com | 1 | 3.29 | 3.29 | |
| Hookup Wire | white 18ga 35' | carquest.com | 1 | 5.00 | 5.00 | |
| Hookup Wire | red 18ga 35' | carquest.com | 1 | 5.00 | 5.00 | |
| Broiler Pan | for oven | Thrift Store | 1 | 1.00 | 1.00 | |
| Power Supply | 16.2V / 2.6A / 34W | Thrift Store | 1 | 1.00 | 1.00 |
Hookup:
- 3 strings of RED LEDs - 5 LEDs per string
- 1 string of Blue LEDs - 4 LEDs per string
- Each LED in a string is connected in series
- All strings are connected in parallel through terminal strip
Power:
The LEDs have different power requirements. Blue = 4V @ 700ma max Red = 3V @ 700ma max Power Supply 16.2V Will not drive LEDs to full capacity. Blue = (3.5V @ 600mA) = 2.10W = 4 LEDs = 14V (one row) Red = (2.8V @ 600mA) = 1.68W = 5 LEDs = 14V (three rows) Resistance - E = I * R (16.2V - 14V ) = 2.2V 2.6A power supply / 4 = .650A 2.2V = .65A * (R) R = 3.38ohm 2.2V * .6A = 1.4W Buy four 2W (or greater) 3.6 ohm resistors (one per row)
Questions:
