MishaGrower
Active Member
Hello everyone! I am considering buying QB-like boards from AliExpress. And I really need advice from experienced growers.
My task is to make additional artificial lighting in the spring-autumn period (temperate continental climate) in a greenhouse near my mother-in-law's country house. Tomatoes, strawberries and all that. It is also possible in the future to switch to year-round use.
There are 2 lots, 288 lm281b+ boards (unknown bins) at $16 and 288 lm301h boards (unknown bins) at $40. Both rated 120w. Heatsinks are also available for ~$15 each. All prices are inclusive of delivery.
I have a choice:
use lm301h boards 2 per 240w driver (120w each) with heatsinks which will cost $110 plus driver,
or try using lm281b+ without heatsinks 4 per 240w driver (60w each) which will cost $64.
Drivers in all cases will be used by MW XLG 240 at ~$48 each.
I tested 301h boards with heatsinks, when ~120W is applied to each, they evenly heat up to ~60-70°C. The measurements were taken with a thermal imager, so they may not be super accurate.
Unfortunately I have no experience with boards with lm281b+ LEDs.
Based on the above, I have a few questions.
Will the lm288b+ boards be able to work with a power supply of 50-60w without heatsinks? Approximately what temperature will be on LEDs at ambient temperature from +10 to +30 °C.
How much in terms of efficiency per watt will be the difference between the two types of boards? lm301h at 120w and lm288b+ at 50-60w (half power). At least approximately.
Electricity costs approximately $50-$65 per 1000 kW/h. It is planned to install LEDs with a total power of about 3kW ($1320 with lm301h or $768 with lm281b+).
My task is to make additional artificial lighting in the spring-autumn period (temperate continental climate) in a greenhouse near my mother-in-law's country house. Tomatoes, strawberries and all that. It is also possible in the future to switch to year-round use.
There are 2 lots, 288 lm281b+ boards (unknown bins) at $16 and 288 lm301h boards (unknown bins) at $40. Both rated 120w. Heatsinks are also available for ~$15 each. All prices are inclusive of delivery.
I have a choice:
use lm301h boards 2 per 240w driver (120w each) with heatsinks which will cost $110 plus driver,
or try using lm281b+ without heatsinks 4 per 240w driver (60w each) which will cost $64.
Drivers in all cases will be used by MW XLG 240 at ~$48 each.
I tested 301h boards with heatsinks, when ~120W is applied to each, they evenly heat up to ~60-70°C. The measurements were taken with a thermal imager, so they may not be super accurate.
Unfortunately I have no experience with boards with lm281b+ LEDs.
Based on the above, I have a few questions.
Will the lm288b+ boards be able to work with a power supply of 50-60w without heatsinks? Approximately what temperature will be on LEDs at ambient temperature from +10 to +30 °C.
How much in terms of efficiency per watt will be the difference between the two types of boards? lm301h at 120w and lm288b+ at 50-60w (half power). At least approximately.
Electricity costs approximately $50-$65 per 1000 kW/h. It is planned to install LEDs with a total power of about 3kW ($1320 with lm301h or $768 with lm281b+).