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Horticutral Lighting
40x130deg HiRack is more suitable for general warehouse aisles
Project info:
Room: warehouse aisle(between racks) 64x4x12m;
Fixture: HiRack 150W linear light (8pcs);
Solution: (different beam angles) 30x70deg / 60x90deg / 40x130deg.
Generally, we take 6~8m as the lamps distance, let’s use 8pcs HiRack linear lights for this project(64m length). With different beam angles, 3 solutions have been worked out as above pic shows.
If only consider the flux on the floor, we can see solution 1 with 30x70deg gets the max flux(average flux, Eav, 368lux), solution 2 with 60x90deg gets the min(180lux), and solution 3 with 40x130deg gets the middle(230lux). And the uniformity(u0) of them are all more than 0.4(taken as the min requirement usually). So we will generally say that, solution 1 is the best lighting solution for this project beating down the other two.
However, in warehouse aisle(between racks) lighting projects, we not only need to care about the flux on the floor, but also should pay attention to surface of the racks(in above simulations designed as the ‘wall’). Because when a goods handling operator driving a forklift in the aisle loading and unloading, he not only needs to see the floor, but also see the goods in the racks on both sides(see below figure 2). And as glare into eyes usually related with the background illumination, we need to do best to shorten the illumination difference between the floor and racks.
Figure 2
So if we see the average flux on the walls(racks), will find that solution1 gets only 98lux, while solution 2 gets 112lux and solution 3 gets 109lux. Compare the flux between the floor and walls, gotten the specific values: 3.76, 1.61 and 2.11. The less illumination difference is, the better solution will be. So conclusion is, 60x90deg the best solution, 40x130deg the second, and 30x70deg can be thrown away now.
To here, we have two solutions(2 and 3) awaiting to be chosen. Although 60x90deg gets a least illumination difference, it only gets 180lux on the floor while 40x130deg gets 230lux. So comprehensively, we will choose the later, solution 3 with 40x130deg.
And not only that, in fact we have another consideration, distributions on the wall. Both solution 1 and 2 appear sharp and steep dark areas at the edges of the wall(solution 2 even appears quite bright patterns on the areas facing to the lamps, see below figure 3), which will cause much glare(even wrong impression) into human’s eyes, while in solution 3 we see the wall illumination very uniform and gentle. So of course we will will choose 40x130deg HiRack for this project.
Figure 3
The 40x130deg HiRack has a quite long and narrow pattern when illuminating, so it’s very suitable for warehouse aisle projects(4m aisle width and 12m height generally), however in further practical lighting applications we still need to calculate with actual dimensions (length/width/height).
