dulridge
Enlightened
Mods please move, I thought I was posting in incandescent lights.
A while ago I built a 6D ROP using cheap 5000mAh NiCd cells. The higher capacity NiMH cells are not all that easily available here and are rather expensive. I used the original KD aluminium reflector which only just passes the ROP bulbs (The central hole is small) but it is still on the original bulb despite 3 complete charge/discharge cycles. It gets hot enough to melt the solder connecting the bulb filament to the casing so I've had to resolder it - I used ROHS lead-free solder which has a rather higher melting point and thus far has given no trouble. Obviously also a non-plastic lens was fitted.
Last month with the toy budget I bought a pair of the KD unprotected D cells (which take forever and a day to charge up on a WF-139 charger which needs watching as it will overcharge these cells (Pulled them off at 4.23V) which it does not do with smaller capacity unprotected cells. The KD cells need magnets to contact one another let alone make contact with the Mag switch. Later version of the KD reflector looks to have about a half inch hole. Again a glass lens.
Now an ROP bulb is an ROP bulb I thought and both should give pretty much the same voltage (And therefore current) when freshly charged.
When I compared the two side-by-side it made the 6D look like its cells were flat. Both Mags have had the switch resistance fixes done and the spring (Have a shorter spring on order for the 2D) resistance reduced.
So here's the beamshot. I thought I'd get a smaller lighter ROP high with a slightly shorter runtime - both the NiCd and the LiIon cells are rated at 5Ah bu the NiCd rating is genuine on testing them. I don't have the equipment to test capacity of lithium cells but others have said their capacity at a 4A drain is below 4000mAh.
The lithium one is about 60% brighter according to my photographic light meter. I'd just charged both sets of cells and the D NiCds are capable of at least 12A on a flash test (12A is as far as my meter goes). Looks like they don't hold their voltage all that well under load. That would be a lot of work to test and I haven't the time just now.
The lithium one is on the right. Both are focussed to their tightest spot at the 8' height of my study ceiling. Note the 2D spot is a LOT bigger. Some playing in Photoshop will probably show that it is less well focussed. I don't have a wide enough angled lens to capture all of the beams at 8 feet.
A while ago I built a 6D ROP using cheap 5000mAh NiCd cells. The higher capacity NiMH cells are not all that easily available here and are rather expensive. I used the original KD aluminium reflector which only just passes the ROP bulbs (The central hole is small) but it is still on the original bulb despite 3 complete charge/discharge cycles. It gets hot enough to melt the solder connecting the bulb filament to the casing so I've had to resolder it - I used ROHS lead-free solder which has a rather higher melting point and thus far has given no trouble. Obviously also a non-plastic lens was fitted.
Last month with the toy budget I bought a pair of the KD unprotected D cells (which take forever and a day to charge up on a WF-139 charger which needs watching as it will overcharge these cells (Pulled them off at 4.23V) which it does not do with smaller capacity unprotected cells. The KD cells need magnets to contact one another let alone make contact with the Mag switch. Later version of the KD reflector looks to have about a half inch hole. Again a glass lens.
Now an ROP bulb is an ROP bulb I thought and both should give pretty much the same voltage (And therefore current) when freshly charged.
When I compared the two side-by-side it made the 6D look like its cells were flat. Both Mags have had the switch resistance fixes done and the spring (Have a shorter spring on order for the 2D) resistance reduced.
So here's the beamshot. I thought I'd get a smaller lighter ROP high with a slightly shorter runtime - both the NiCd and the LiIon cells are rated at 5Ah bu the NiCd rating is genuine on testing them. I don't have the equipment to test capacity of lithium cells but others have said their capacity at a 4A drain is below 4000mAh.
The lithium one is about 60% brighter according to my photographic light meter. I'd just charged both sets of cells and the D NiCds are capable of at least 12A on a flash test (12A is as far as my meter goes). Looks like they don't hold their voltage all that well under load. That would be a lot of work to test and I haven't the time just now.
The lithium one is on the right. Both are focussed to their tightest spot at the 8' height of my study ceiling. Note the 2D spot is a LOT bigger. Some playing in Photoshop will probably show that it is less well focussed. I don't have a wide enough angled lens to capture all of the beams at 8 feet.
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