What lighting kit do you actually need for your first weddings?
How to read a flash spec sheet like someone who has been burned: what guide numbers hide, why watt seconds and guide numbers cannot be compared, and the buying order that follows. No prices: they would be stale in a month.
KEY TAKEAWAYS
- Compare guide numbers only at the same stated zoom and ISO. At 200mm two current flagships both publish GN 60; at 35mm the same units publish 31.9 and 36.0. The headline number is the flattering condition, not the working one.
- Watt seconds and guide numbers are two conventions that do not talk to each other: one maker publishes energy and no guide number for a unit, another publishes guide numbers and no energy figure. Any cross brand power comparison you read is someone’s derivation, not a spec.
- A recycle time without its duty cycle is close to meaningless. The honest published tables measure one flash every 30 seconds on fresh cells: a first dance asks for many times that rate.
- The buying order that follows from all of this: one manual speedlight, then a stand, trigger, and gels, then the second light. Skills transfer between brands; receipts do not.
Why there are no prices here
A kit article with prices is stale by the next promotion and wrong in the next country. Our source record for this pillar holds manufacturer specifications, fetched and dated, and no pricing, so this chapter prices nothing and instead teaches the part that stays true: what the spec sheet says, what it hides, and what order to acquire things in. Bring your own current prices to the framework; the framework will outlive them.
Reading a spec sheet like someone who has been burned
The off camera chapter establishes what a guide number is; here is how makers present them. Canon’s EL-1 and EL-5 both headline a maximum guide number of 60 meters at ISO 100, and both publish the full table by zoom position, where the same two units read 31.9 and 36.0 at the 35mm coverage a wedding actually uses.1 Nikon states the SB-5000 at 34.5 meters at 35mm, 55 at 200mm, with ISO, temperature, format, and illumination pattern all named,2 which is the most fully conditioned guide number in our record and the template to hold every other sheet to. Godox states the AD200Pro II at GN 52 at 35mm with its speedlite head, GN 60 with the bare bulb head at 28mm, two numbers for one unit depending on the head fitted.3 The pattern across all of them: the headline is the longest zoom and the friendliest head; the working number lives in the table, at your zoom. A sheet that states its conditions is being honest with you; a retailer blurb quoting one bare number has already dropped them.
Watt seconds and guide numbers do not talk to each other
Here is the trap in comparing across brands. Godox publishes the V1Pro at 76 watt seconds of stored energy, and its spec table carries no guide number at all. Nikon publishes the SB-5000’s guide numbers and no watt second figure anywhere in its specifications.2,4 One convention states energy in, the other states light out under stated conditions, and converting between them requires reflector efficiency and spectral terms that appear on no spec sheet. The standard reference’s guide number formula makes the point formally: it contains unit specific factors nobody publishes.5 So when a forum tells you unit A at 200 watt seconds is exactly such and such stops more than unit B at 76, that figure is a derivation resting on unpublished assumptions. The honest cross brand comparisons are: guide numbers at the same stated zoom and ISO where both makers publish them, and beyond that, a test frame with your own units, which settles it in one evening.
Recycle times and the duty cycle
The second spec that decides a wedding night is how fast the flash returns, and the published numbers carry a condition the internet always drops. Nikon’s specification tables for the SB-5000 give approximately 2.6 seconds minimum on alkaline cells and 1.8 on NiMH at manual full output, and the SB-700’s table states the measurement protocol: one full output flash every 30 seconds, fresh batteries, 20 degrees C.2 A first dance asks for a frame every few seconds. The spec is not lying, it is measuring something gentler than a wedding, and a buyer comparing two makers’ recycle claims is comparing two different mercy levels unless both name their protocol. The working conclusions: NiMH over alkaline is the one upgrade the tables themselves justify, and staying at 1/8 power or below matters more than any battery, because low power recycling is near instant and full power recycling never is.
The buying order
- One manual speedlight with a fully conditioned spec sheet. It is your bounce light on camera and your first off camera light; every chapter in this pillar runs on it.
- The support kit that makes it a system: a stand with a wide base, a trigger pair, a ¾ CTO and ½ CTO gel, and NiMH cells. This step is cheaper than any flash and doubles what the flash can do.
- The second identical speedlight. Identical, so power ratios stay predictable and one set of gels, batteries, and habits serves both. Rim light, rain light, or the reception corner light while the first rides the camera.
- Only then, more power: a 200 watt second class unit with interchangeable heads earns its place when modifiers and sun fill enter your work, which for most people is well after wedding ten. Rent one first: an evening of renting answers what no spec sheet can.
| SCENARIO | ISO | SHUTTER | APERTURE | FLASH | CHANGE THIS FIRST |
|---|---|---|---|---|---|
| What light 1 does: bounce, whole reception | 1600 | 1/160 | f/2.8 | 1/8 | See the reception chapter |
| Lights 1+2: portrait + rim at dusk | 200 | 1/200 | f/2.8 | 1/16 key, 1/32 rim | Rim power, to taste |
| Lights 1+2: dance floor cross light | 1600 | 1/125 | f/2.8 | 1/16 both corners | Positions, not power |
| The rented big unit: sun fill at noon | 100 | 1/200 | f/8 | 1/4 through modifier | Distance, modifiers eat reach |
Starting estimates showing what each stage of the kit unlocks. Assumes a full frame body and manual flashes with guide numbers in the 34 to 60 meter class at ISO 100 as published in the cited spec tables. Every row is a seed for a test frame in the relevant chapter, not a promise about any specific product.
This chapter compares only what the cited spec tables publish, at their own stated conditions. It will not convert watt seconds into stops across brands, quote street prices, or rank products: the first is underdetermined by published data, and the other two expire. Model names appear because their published numbers teach spec sheet literacy, not as endorsements; we have no relationship with any maker named, and the skills here transfer to whatever is current when you read this.
Frequently asked
Should both of my speedlights be the same brand as my camera?
They need to speak your camera’s trigger protocol, which third party systems do at a fraction of first party cost, usually traded against service networks and firmware pace. What matters for this pillar is manual power control, a published conditioned guide number, and a reliable trigger pair. The chapters never assume a brand.
Is a 200 watt second unit twice as powerful as a 76 watt second one?
It stores more than twice the energy, and what that yields as light on a subject depends on head, reflector, and modifier terms no maker publishes, which is exactly why this chapter refuses the cross brand arithmetic. Where the same maker publishes guide numbers for both units at the same conditions, compare those; otherwise compare test frames.
What about constant LED lights instead of flashes?
Constant light shows you what you are getting and video can share it, but at wedding distances it competes with the room instead of overpowering it, and it asks the couple to be lit all evening. The pillar’s methods assume flash for reach and discretion. An LED earns a place later, as a detail and reception ambience tool, not as light one or two.
SOURCES
- Canon Speedlite EL-1 and EL-5 Advanced User Guides, guide number tables by zoom position at ISO 100, cam.start.canon, fetched 2026-08-04.
- Nikon SB-5000 and SB-700 Speedlight specifications, imaging.nikon.com and Nikon Japan’s specification tables for recycle protocols, fetched 2026-08-04. No watt second figure appears in any of the four Nikon documents checked.
- Godox AD200Pro II product specifications, godox.com: per head guide numbers with conditions, 200 watt second rating, and published flash durations, fetched 2026-08-04.
- Godox V1Pro product specifications, godox.com: 76 watt second rating; its Tech Specs table carries no guide number. Fetched 2026-08-04.
- Jacobson, R.E., Ray, S.F., Attridge, G.G. and Axford, N.R., The Manual of Photography, 9th edition, Focal Press, 2000: the guide number formula and its unit specific reflector and efficacy terms; paraphrased because the freely readable copy is a scanned text.